Lenovo laptop does not turn on screen burns

Table of Contents

Laptop screen won’t turn on

1) The first reason why the laptop screen does not turn on may be a power surge.

Each of us has come across the fact that the light bulbs in the apartment blink, this indicates voltage drops in the network. The laptop is a sensitive technique, the slightest surge in the network can disable it. But in most laptops, there is a protective function against strong surges. When this protective function is triggered, the laptop may not immediately exit this mode. In order to restore the laptop’s performance, you need to disconnect it from the network, remove the battery, press the power button for 10 seconds, and then insert the battery back, connect the laptop to the network and turn it on. These steps will help bring your laptop out of protective mode to normal.

2) The second reason why the laptop screen does not turn on is most often the power supply.

Over time, power supplies begin to fail, some people fail immediately, and sometimes gradually. In the second case, the symptoms may be as follows, the laptop does not always turn on the first time, or the laptop turns on with noise, but there is no image. All these signs indicate a malfunction of the power supply. To check the power supply, it is best to take it to the service, where specialists will give an accurate conclusion.

3) The third reason why the laptop screen does not turn on may be RAM.

It is because of this small bar that various problems can arise, starting with the disappearance of the image on the screen, ending with a blue screen with white inscriptions. Do not be immediately afraid that the memory needs to be changed to a new one. In some cases, it’s not all that scary. First of all, we unscrew the back wall of the laptop and take out the RAM.

We take a washing machine and clean the contacts. Over time, the contacts become clogged with dust, and sometimes oxidize, all of which leads to poor conductivity. After we cleaned the contacts, insert the memory bar back into the laptop and try to turn on.

4) The fourth reason may be a dead BIOS battery.

This battery is used to power the BIOS while the laptop is turned off. This is necessary so that parameters such as date, time and many other data do not get lost even after the laptop has been off for a long time. Each battery has its own resource, and when the battery runs out, the laptop may react differently. Sometimes it turns on, but the date and time are constantly getting lost, and sometimes it may not turn on at all.

5) The fifth reason why the laptop screen does not turn on is a bent display cable.

Every day we use a laptop, open and close the display, due to the large number of openings and closings, the loop is frayed and the image on the screen disappears. Most often, the loop is partially out of order, and if you select a certain angle of inclination of the display, the image will appear for a while. But these are the most extreme measures if you urgently need to look at something in a laptop. If you notice that the image sometimes disappears on your laptop or the picture is shown in stripes, flickers, it is better not to delay and contact the service to replace the frayed cable.

6) The sixth reason why the laptop screen does not turn on is a short circuit of the keyboard.

This is one of the rarest cases, but it is still worth mentioning. Let’s see how the keyboard closes. Due to frequent pressing of certain keys, over time they fail, and then either sink or, when pressed strongly, they close the plate and a short circuit occurs. In this case, the laptop may beep, or the screen may not turn on, the consequences may be up to the fact that the laptop may not turn on completely.

7) The seventh reason why the laptop screen does not turn on is the failure of the inverter.

This device serves to convert the voltage of the display backlight lamp. Due to its complex design feature, the inverter often fails and cannot be restored. This breakdown can be determined by connecting a working monitor to the laptop. If a picture appears on the monitor, most likely your inverter is broken.

8) The eighth reason why the laptop screen does not turn on is the failure of the backlight.

A poor-quality display backlight can fail very quickly. Make sure that the problem is in the lamp is not difficult. Turn on the laptop, illuminate the display with a flashlight, if you see a dim image, then the problem is in the lamp.

9) The ninth reason why the laptop screen does not turn on is a broken video card.

Powerful video cards are built into modern laptops, which get very hot and often fail. It is not difficult to check that the video card is out of order, the monitor will help us in this. We connect it to the laptop, turn on the laptop, if there is no image, then the video card is most likely out of order. Also, the failure of the video card is sometimes accompanied by a squeak of a laptop, which signals to us that something is wrong with the hardware of our computer friend.

10) The last reason why the laptop display may not turn on is the failure of the motherboard.

The motherboard is the largest and most complex part of a laptop outside of the display. It consists of many chips, which are the connecting link of all components of the laptop and ensure the stable operation of the system. To make sure that there are no problems with the motherboard, it is better to give it to a specialized service center, where they will carry out comprehensive diagnostics on bench equipment and identify all problem areas of your motherboard.

Solution 3

The latter solution also requires hardware intervention, namely, to check the RAM.

Flip the laptop over and find the module where the RAM is inserted. Remove the RAM, but do not touch the metal part. Insert the RAM in another slot. Turn on the laptop and check the work. If no changes, try moving the RAM to a different slot, and check again.

Perhaps this is all that you can do yourself to fix the problem when the laptop works but the screen does not turn on. Otherwise, you should contact the service center for the help of a wizard.

In this article, we will look at possible solutions to the problem when the laptop works but the screen does not turn on. This can happen to every user for different reasons.

We recommend that you read our article sequentially, i.e. first solution, second solution, and so on, since we have ranked them in order of popularity. It is the first solution that most often helps most laptop users.

So, let’s see what to do if the laptop works, but the screen does not turn on.

Solution 1

First, you should unplug the power cord if it is still plugged in. Then turn the laptop over and remove the battery from the back panel. Turn the laptop over again to its normal position. Make sure the power cord is unplugged.

Now hold down the power button, hold it for 30 seconds, then release it. Next, connect the power cable, but do not insert the battery. Press the power button to turn on the laptop.

Check if the problem has been resolved. If the laptop works, but the screen still does not turn on, repeat the steps again, but now hold the button for 1-2 minutes.

Cleaning contacts of RAM

This is usually done easily. Power off the laptop, disconnect the battery, and turn it upside down.

Removing the cover for installing memory in a laptop

A cover should be present here, usually attached with a pair of bolts. It needs to be unscrewed and opened.

You should see something like this.

RAM sticks in a laptop

Small rectangular boards are RAM. They all need to be removed by moving the metal holders aside.

Removing RAM in a laptop

After removing, wipe the contacts with a regular eraser or alcohol and if there are several memory sticks, try to insert them one at a time, each time turning on the laptop.

The key is on the RAM bar. Wipe the contacts to the right and left to the end

Lenovo laptop screen does not light

In this article, we will look at possible solutions to the problem when the laptop works but the screen does not turn on. This can happen to every user for different reasons.

We recommend that you read our article sequentially, i.e. first solution, second solution, and so on, since we have ranked them in order of popularity. It is the first solution that most often helps most laptop users.

So, let’s see what to do if the laptop works, but the screen does not turn on.

Connecting an external monitor / TV

If after the result described above there is no result, then you need to try to display the image on an external monitor or TV to check the performance of the matrix and its loop.

VGA output in laptop for connecting an external monitor or TV

To do this, you will need any monitor or TV, as well as a cable that connects your desktop computer to the monitor. It is called VGA or HDMI.

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HDMI output in a laptop for connecting an external monitor or TV

After connecting a monitor or TV to your laptop, try turning it on. If the image appears on the monitor, then you have a problem with the matrix or matrix cable.

We connect a laptop via an external monitor

What makes this happen?

There may be several reasons for this laptop behavior. Starting from the lost BIOS settings (UEFI) and exit from the standing matrix (matrix cable), and ending with serious problems with the motherboard (north, south bridges, video card).

Now you will learn what you need to do in stages to diagnose and fix this problem.

Reset laptop settings and turn on without battery

The first step in such a situation is to disconnect the laptop from the network and then remove the battery.

Removing the battery from the laptop

Now without connecting it to the network and without inserting the battery, press the power button and hold it for about 30 seconds.

Laptop power button to hold

After that, connect the laptop to the network without a battery and try to turn on.

Solution 2

So, if you are reading our article further, then the first solution did not help, and the laptop continues to work, but the screen does not turn on. In this case, you should make sure that the problem is not with the laptop screen.

Connect your laptop to an external monitor or TV via HDMI or VGA port. Then you need to press F8 to sync the laptop with the external monitor. If nothing happens, try the F3, F10 or other keys, depending on your laptop manufacturer.

As a result, you should see the laptop screen on an external monitor. If this happens, then the problem is still in the screen, most likely in the backlight inverter. In this case, you should contact the service center to have it repaired.

Solution 2

So, if you are reading our article further, then the first solution did not help, and the laptop continues to work, but the screen does not turn on. In this case, you should make sure that the problem is not with the laptop screen.

Connect your laptop to an external monitor or TV via HDMI or VGA port. Then you need to press F8 to sync the laptop with the external monitor. If nothing happens, try the F3, F10 or other keys, depending on your laptop manufacturer.

As a result, you should see the laptop screen on an external monitor. If this happens, then the problem is still in the screen, most likely in the backlight inverter. In this case, you should contact the service center to have it repaired.

4 TIMES

VIDEO CARD

1 TIME

CPU

8 TIMES

POWER SUPPLY

You can find out possible causes and solutions to problems by going to the “Questions and Answers” section

Central processing unit (CPU). it is the main working component of a computer. If the indication indicates to you a malfunction of the central processor, then you need to contact the service center for help. This problem cannot be solved on your own. Since the malfunction of the central processor may be the result of some other, more serious malfunction. For example, incorrect laptop power modes.

A rather rare malfunction. May occur when the laptop BIOS is not updated correctly.

Most modern laptops have BIOS protection and recovery mechanisms.

Therefore, if there is an error in the functioning of the BIOS, you may not even pay attention to the indication, because if such an error is detected, the laptop will restart and the recovery procedure will automatically start. When the recovery procedure is completed, the laptop will also restart. The only thing that you may notice is a longer (than usual) boot process, as well as a message on the screen that the BIOS has been recovered from an error. If this error occurs intermittently, you may need to update the BIOS.

If this type of error occurs, you can use the following guidelines to identify the faulty memory module:

  • Determine how many slots and memory modules are installed in your laptop. The number of slots can be from 1 to 4
  • Try to remove each memory module (if there are more than one) one by one from the slots and reinstall
  • Try to install each memory module (if there are more than one) in slot 1 one at a time It is possible that only one of the memory modules is faulty
  • Install another memory module with the same specifications and that is known to be good.

You need to contact the service center for help. In most modern laptops, the video card is integrated (soldered) onto the motherboard. Most often, this type of malfunction leads to the replacement of the laptop motherboard itself or the replacement of the video chip.

In this case, you also need to contact the service center for help.

To determine the malfunction in the laptop power system, use the recommendations described below.

Determining laptop malfunctions using the power and battery indicator

The Power and Battery LED indicates the operating status of the AC adapter (power supply) and laptop battery (battery). If, when you turn on the laptop or while it is running, you notice the blinking power and battery indicator, then this means that there is a problem with one of these two components: either the power adapter is faulty or the battery is problem.

Using the information below, you can try to identify the faulty component.

Power indicator is off

BATTERY OR ADAPTER

3 TIMES

MEMORY

5 TIMES

MOTHERBOARD

The laptop blinks and won’t turn on!
How to identify a malfunction?

Is your laptop broken? Are you trying to turn it on, but there is only a blank black screen in front of you? This is a very unpleasant situation, but even in such a situation, you can try to restore its performance, or at least try to determine what exactly is faulty in the laptop.

The most common cause of a malfunction is one of the components of the laptop power system, but sometimes there are more serious malfunctions, which we will also consider in this article. We will begin to identify the faulty component a little later, since it is necessary to start with other steps.

Fault definition

In order to determine which component of the laptop is faulty, there is a system of external indication of error codes. For this, LED indicators (light bulbs) of power (battery charge) are used, as well as indicators of the Caps Lock and Num Lock buttons of the laptop keyboard.

When turning on the laptop, you need to pay attention to one (or more) indicators located on the Caps Lock or Num Lock buttons. These indicators (“lights”) will flash periodically. The number of repeated signals will indicate an error code.

Using the information below, you can try to identify the problem with the laptop or its faulty component. Basically, this system of codes is suitable for HP notebooks manufactured from 2011 to January 2015, but it is possible that some codes will work for most notebooks from other manufacturers, for example, Asus, Acer, Sony, Samsung, etc.

The laptop turns on. the screen is black

If your laptop still turns on, but the screen remains black, then this indicates a malfunction in the computer hardware. over, such a malfunction does not occur instantly, of course, if you did not drop the laptop or subject it to strong mechanical stress. Failure of a backlight lamp or matrix inverter is usually accompanied by screen flickering, as well as uneven backlighting. These signs already indicate that the display may stop working soon.

Other reasons may be the failure of the RAM, as an option, incorrect installation of the memory strip into the slot. The RAM must be tested using a special program, for example, Memtest86. Incorrect operation of the processor or north bridge, errors in the BIOS firmware. these are the reasons why the laptop can start with a black screen. Also pay attention to the CapsLock and NumLock indicators, they often start blinking in a certain way, indicating a particular hardware problem in your laptop. You can decode such signals on the device manufacturer’s website.

If at the initial stage of loading, some information is displayed on the screen, but then the display goes blank, then the problem is probably related to the inability to initialize the BIOS. This malfunction is caused by overheating of laptop components, in particular, the chip of the south bridge, the processor (in this case, reboots occur some time after the laptop is turned on). Power outages can also affect BIOS performance, especially when the battery is dead. If the issue of overheating can be solved by replacing the cooler, then it is better to entrust the search and elimination of problems with the BIOS firmware and other hardware faults to a specialized service center.

Another symptom that the user may encounter is the laptop freezing after turning on. In this case, the computer does not respond to pressing buttons on the keyboard. Such cases are often encountered when there are problems with the hard disk or with the operating system itself. To diagnose the hard drive, you need to perform a special test, for example, with the HDDScan program. Testing will check the integrity of the hard disk sectors. It is also necessary to check the correctness of its connection. The failed south bridge may also be the culprit.

The laptop does not turn on and shows no signs of life

Let’s say that the laptop does not respond at all when turned on. Why is this happening and what to do in this case? First you need to make sure that the power supply system is working. Usually, there is a charge indicator LED at the place where the charger is connected. If the indicator is on, then power is most likely supplied to the device normally. If you do not have a power indicator or it does not light up, then you need to make sure that the charger is working properly, for example, by connecting it to another laptop or by measuring the voltage at the plug being connected. In the latter case, you will need a special device. a multimeter, which must be able to use. Of course, the best option is to connect a guaranteed working “charger”, tested on other computers.

After excluding the charger from the list of possible causes of malfunction, you should check the battery. Often, due to its malfunction, the laptop does not turn on even when the power source is connected. Remove the laptop battery and press and hold the power button for one minute. In this case, the charger should not be connected to the laptop. Without inserting the battery, connect the charger to the laptop and try to turn on the laptop. If it does not start, then the power module on the motherboard may be faulty or there is a short circuit in the power circuit and even incorrect BIOS firmware of the motherboard. It is almost impossible to diagnose and eliminate such malfunctions without special equipment, therefore, in this case, a direct road to a laptop repair service center.

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Another likely reason for the laptop not turning on is a malfunction of the power button itself. Its contact group or the lead-in loop may become unusable. On many laptop models, the button also illuminates when pressed. Therefore, if the power indicator of the laptop is on and the battery is definitely working, and the button does not respond in any way to pressing, then this may be the case. In this case, you will have to contact the workshop.

Why the laptop won’t turn on

If your laptop refuses to turn on, then there may be several reasons. But first you need to decide on the concept “does not turn on.” If, when you press (or hold down the power button) while the charger is connected, the laptop does not start, that is, you cannot hear the fan turn on, the screen remains black, then this means that the laptop does not turn on. In other cases, for example, when the screen remains black and you hear a fan noise, your laptop has turned on, but there are other problems with displaying images, etc. We’ll look at both options.

Software problems

This kind of problem can be attributed with a stretch to the category “laptop does not turn on”, since, in fact, the computer starts up, but questions arise about the installed software. This is a separate big topic. But still, let’s briefly go over the possible symptoms and solutions to problems.

If the reason lies in the area of ​​software, then the first thing to try is to start the operating system in safe mode. Usually, to do this, before starting to boot Windows, you need to press F8 and select the boot option from the proposed list. Click “Safe Mode”. If in this mode the laptop starts up normally and no freezes occur, then you should check the computer for viruses. Also, if you installed any software before the problems, especially drivers, then they must be removed.

If, after all the manipulations in the normal boot mode, freezes or reboots still occur, then you need to check the integrity of the operating system files. To do this, you need to install a disk with the original OS image into the drive and execute the SFC / SCANNOW command in the command line. The results of the scan will automatically restore damaged system files.

The radical and most recent solution to problems with the operating system will be a complete reinstallation. Do not forget to make a backup copy of important files stored on the system drive.

Typically, most laptop hardware problems are best diagnosed and fixed at a service center. But experienced users are quite capable of dealing with software errors.

The laptop has a black screen, but the coolers start

One of the varieties of the problem is when after booting the system nothing is displayed except for the cursor on a black background. This happens on older laptops and may be due to too old BIOS version of the motherboard. Why does this situation arise:

Windows 10 or other modern next-generation operating system automatically downloaded and installed new drivers for the graphics card;

the power control circuitry embedded in these new drivers is unable to function properly with the old motherboard resources;

when starting the device, the monitor cannot fully display the image, although everything else works fine. you can hear the sound of the system starting, coolers make noise, the power indicator is on.

As a result, all the user can see is a black screen and a cursor on it. If you have an older Acer or Asus laptop, you can try closing and lifting the lid, often enough for the picture to appear. But your best bet is to update your BIOS firmware. To do this, go to the official website of the laptop manufacturer, find the “Files”, “Downloads” or “Support” section, and then download the appropriate update file. It always comes with step-by-step installation instructions.

Solutions

The first thing to check is whether the power plug of the device is tight enough and whether the wire is damaged in bends, and also whether the battery is charged. Surprisingly, such SIMple problems often confuse users. If everything is in order, then check the following aspects point by point:

Battery performance. Connect the power to the laptop. The indicator should light up, indicating that the battery is charging. If it does not light up, then remove the battery and, using an eraser, clean the contacts on the laptop and on the battery if there is a semblance of plaque or oxidation on them. Then use up the remaining charge by holding down the power activation button. Insert the battery and try turning on the device. If it does not turn on, then it is likely that the battery is out of order.

The ramps may become unusable due to, for example, liquid spilled on the keyboard. Then the laptop has a black screen. To check the RAM, you need to disconnect the laptop from the network, remove the battery, and unscrew the screws from the cover under which the memory is installed. Remove the modules and clean the contacts using the same eraser. Put everything back and try to turn on the device.

Next, you need to check the video system. Check that the ribbon cable that connects the graphics card or motherboard to the graphics matrix is ​​working properly. To do this, you can connect a TV or a regular monitor to your laptop via HDMI or older VGA, DVI. If an image appears on another output device, then the problem is definitely in the backlight of the laptop display. Only a specialist can replace it, this is a difficult task.

Also, a black screen on a laptop can mean problems with the operating system or drivers. Often, returning to a previous system restore point, resetting it (in the case of using Windows 10), or a complete reinstallation helps. Finally, you can try resetting your BIOS settings. This is done blindly, because the laptop turns on, but the screen is black. Press the power button, then the key several times to start the BIOS. After a few seconds, press F9 to reset, then F10 to exit and Enter to save. Depending on which laptop model you have (HP, Lenovo, Asus, Acer, etc.), the aLGorithm may be slightly different. you need to press the right or left arrow to select Yes, or press the Y button to confirm. You can find out which button gives access to the BIOS from the instructions for a specific device.

After turning on the black screen on the laptop. what to do

If, after starting the device, the indicators are on properly, the system boots, but suddenly at some stage a black screen appears, then the reason is most likely hardware-based and related to the battery. If the battery has failed, if there is a chance to partially restore it by applying a sawtooth voltage, but this is a difficult method. Easier to buy a new battery.

This problem is often faced by owners of rather old devices, whose battery is no longer able to fully hold a charge. If your laptop Lenovo, Acer or another brand is still new, then you should try to reinstall the system or immediately take the device to a service point.

What to do if the laptop screen is black but it works

If the laptop is noisy, the lights are on, but the display is off, then you can try to reset the settings according to these instructions:

Disconnect the device from the mains, remove the battery and hold down the start button for twenty seconds.

Reinstall the battery, connect the power supply.

Turn on the device in standard mode. After that, the settings should be reset.

If it does not help, then it is reasonable to check the display for performance. This check has already been described above: you need to connect another output device (monitor, TV) through the HDMI, DVI or VGA port. If the image is displayed on it, then the loop or backlight problems are obvious.

You can also disconnect all external devices from the device. mouse, flash drives, additional keyboard, headphones, modems, and so on. Probably, one of them conflicts and gives the indicated problem.

Replacement of spare parts

If the POST card is not available, but there are spare computer elements, then try replacing the ones installed in the laptop with equivalent ones. Attention: do this only if you have a clear idea of ​​how the laptop works, otherwise you can completely break it.

Change one element at a time and try to turn on the device. For example, RAM, hard drive, and so on.

Additional methods for solving the problem

It is worth mentioning in the article a few more methods that are considered extreme measures. You have to resort to them extremely rarely, but this is not a reason not to talk about them.

You can check the operation of the laptop hardware at the time of boot using POST. a special card for self-testing. Its purpose is to determine the reason for stopping the download or the normal operation of any components, including the screen. POST cards are available for laptops that can be connected to USB or miniPCI connectors.

When the card is connected, when the device is turned on, codes will be displayed on its screen, each of which signals which component is being checked at the current time. As soon as a problem is encountered, POST displays information about it on the screen and stops working. From the instructions attached to the card, you can find out the decoding of the codes.

Why the laptop won’t turn on (black screen) but the lights are on

The main groups of reasons why such a problem may appear:

Damage to the south or north bridge of the motherboard due to overheating or mechanical stress.

Broken graphics card or processor.

Breakage or loss of RAM.

Problems with the hardware settings of the device.

Broken battery.

Faulty loops responsible for connecting the laptop matrix with the screen elements.

In some points, you cannot do without replacing parts, and in some you can do it yourself. clean the fans from dust, remove possible obstacles to air exhaust from internal components.

What to do if the laptop does not turn on and a black screen is on

The main possible causes of this problem:

Mechanical damage to the device.

Liquid spills on internal components and contacts.

Inadequate cooling resulting in overheating.

RAM memory problems.

Incorrect component settings.

Battery breakdown.

Damage to the display and related parts (matrix, loop).

Graphics accelerator issues causing black screen on laptop.

Many of these problems can be fixed at home with your own hands, but some are best left to professionals.

Why is the laptop screen black?

When turning on the laptop, a black screen may appear for software or hardware reasons. The user himself, especially if he is a beginner, cannot always solve the problem, so we have prepared a material designed to help with this. And if you prefer to trust specialists, then contact our company for laptop repair.

Power problems

The following nodes can be source of trouble:

  • The outlet where you plug the laptop power adapter.
  • The power supply itself, not charging the battery.
  • Battery power controller not supplying voltage to cells.
  • Depleted cells that no longer take charge.
  • Power button preventing the device from turning on.
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If you cannot fix the problem yourself, you must contact a specialist.

What to do if Lenovo laptop won’t start

As mentioned above, any peripheral device that does not work correctly can be the cause of lags when starting a laptop. Try disconnecting all devices connected via USB ports. If the problem is in any of them, the laptop will start normally.

Black screen at startup, coolers work, but no indicators

The reason for this situation is often a banal glitch. In this case, it is enough to turn off the power supply and remove the battery for a few seconds. After turning on the laptop, it is likely that it will start as usual.

The second, less common reason is that the BIOS settings are lost and the laptop cannot correctly determine the connected equipment. In this case, you will have to blindly reset the settings, as there is no image on the screen. Although it is possible that when the BIOS interface is turned on, the picture will appear.

To switch to this mode after restarting the computer, press the F2, F8, Escape or Delete button several times (which one depends on the model of the motherboard and the BIOS version embedded in it). After you hear a slight click, press the F9 button to reset the BIOS settings, and then F9 to save the changes and restart the device.

The main problems with turning on the laptop

They can be divided into 3 groups. related to the hardware part of the device, power supply and software.

Software problems

In this case, the following can be noted:

  • Graphics adapter drivers are missing or not working correctly, so there is no image.
  • Incorrect BIOS settings, due to which the motherboard does not detect a piece of hardware.

You can fix such problems yourself

lenovo, laptop, does, turn

Instructions for diagnosing power problems

The first thing to check is the power outlet where you usually plug your laptop power adapter. Plug in any other device here to determine if it works.

It is better to use a multimeter to test the power supply. The red pin must be inserted inside the laptop plug, where there is a connector for a SIMilar pin in the device case. Place the black pin against the outside of the connector. The operating voltage of the power supply is usually 15 to 20 volts. You can also use a SIMilar power adapter. If at the same time the LED on the laptop lights up, indicating that the battery is charging, then the problem is in the adapter.

And another reason that the laptop does not start can be trivial. the owner SIMply forgot to charge the battery. Try to charge the device and turn it on after a couple of hours. Cleaning the contacts with an eraser can also help. both on the battery itself and on the laptop.

If the laptop does not react at all to pressing the power button, then most likely it was she who broke. An inoperative laptop, when trying to start, should at least emit at least a faint click. You can try to fix the button, but for this you already need to tear apart the laptop. The design of this part is primitive, so the best repair option is to completely replace it: if something inside is physically broken, it is no longer possible to fix it.

What to do with black screen when turning on Lenovo laptop

If the Lenovo laptop does not turn on. a black screen or crashes into blue, the power key does not work, there are other problems, you do not always need to contact the service center. Sometimes it takes basic user action to turn on a Lenovo laptop and get it working. This guide will show you what to do if your Lenovo laptop won’t turn on and what diagnostic and repair methods you can use.

What can be done at home

Another reason why the laptop may not turn on is the lack of contact between the motherboard and the RAM. In this case, the cooler will work and the LEDs will be on, but even the motherboard splash screen will not start and you will see a black screen.

In this case, you will need to disassemble the laptop. ALGorithm of actions:

  • Disconnect the power supply and remove the battery.
  • Using a Phillips screwdriver, unscrew the screws on the bottom cover, including the battery compartment. Some of them may be hidden under stickers or laptop legs.
  • Gently pry off and remove the plastic keyboard cover that protects the buttons.
  • Dismantle the keyboard by pressing a pair of slotted screwdrivers on the special slots on the side of the monitor. Disconnect the keyboard cable from the motherboard.
  • Use a Phillips screwdriver to remove any screws you see. Remove optical drive.
  • Remove the bottom cover. Disconnect components that prevent you from reaching the RAM bar.

In laptops, the RAM is no larger than a pair of matchboxes stacked together. It looks like a textolite printed circuit board with several chips on it. This component is inserted into a slot parallel to the mother chamber at the bottom, from the side of the bottom cover. You can use an eraser or rubbing alcohol to clean the RAM contacts.

And since you have disassembled the laptop, at the same time clean it from dust. As a conductor, it can cause a short circuit and prevent the device from turning on. Blow out all the “insides” of the computer using a household hairdryer, vacuum cleaner or can of compressed air.

It is not recommended to install metal nozzles. only plastic ones. When metal comes into contact with electronic components, static electricity breakdown and failure of expensive parts are possible.

Black screen at startup, but lights come on

The reason is most likely that there is no image on the screen. As mentioned above, it is either the LEDs in the matrix backlight burned out, or the loop that connects the graphics adapter and the display is frayed. If the problem is in the cable, then usually when the angle of inclination of the top cover is changed, the image on the display may appear briefly.

A broken cable can be replaced, including by yourself. Usually a laptop is assembled according to a modular scheme: both on the motherboard and on the matrix there are slots where the ribbon cable is connected. The most difficult thing is to get a suitable train, especially if the laptop was released several years ago.

Burnt-out LEDs are not as frivolous as they might seem. The point is that they do not change: the entire matrix must be replaced. This is a little expensive, since its cost can be up to a third of the device, even if you find used components.

You can also connect an external monitor or TV via the HDMI port, which is found in any modern laptop. If there is an image on the external display, then there is a problem with the laptop screen. If there is no image, one of the possible problems may be a breakdown of the video card, which because of this does not give a picture.

What makes this happen?

There may be several reasons for this laptop behavior. Starting from the lost BIOS settings (UEFI) and exit from the standing matrix (matrix cable), and ending with serious problems with the motherboard (north, south bridges, video card).

Now you will learn what you need to do in stages to diagnose and fix this problem.

What to do if, when you turn on the laptop, a black screen, but the light is on and the cooler is working?

In this article, we will talk about such an unpleasant symptom for any laptop, such as a black screen when turned on. over, the light bulbs can burn and even the cooler will spin. But there will be no image on the screen.

Now you will learn what to do if you find yourself in a SIMilar situation in order to try to bring the laptop back to life on your own at home.

Reset laptop settings and turn on without battery

The first step in such a situation is to disconnect the laptop from the network and then remove the battery.

Removing the battery from the laptop

Now without connecting it to the network and without inserting the battery, press the power button and hold it for about 30 seconds.

Laptop power button to hold

After that, connect the laptop to the network without a battery and try to turn on.

Connecting an external monitor / TV

If after the result described above there is no result, then you need to try to display the image on an external monitor or TV to check the performance of the matrix and its loop.

VGA output in laptop for connecting an external monitor or TV

To do this, you will need any monitor or TV, as well as a cable that connects your desktop computer to the monitor. It is called VGA or HDMI.

HDMI output in a laptop for connecting an external monitor or TV

After connecting a monitor or TV to your laptop, try turning it on. If the image appears on the monitor, then you have a problem with the matrix or matrix cable.

We connect a laptop via an external monitor

Cleaning contacts of RAM

This is usually done easily. Power off the laptop, disconnect the battery, and turn it upside down.

Removing the cover for installing memory in a laptop

A cover should be present here, usually attached with a pair of bolts. It needs to be unscrewed and opened.

You should see something like this.

RAM sticks in a laptop

Small rectangular boards are RAM. They all need to be removed by moving the metal holders aside.

Removing RAM in a laptop

After removing, wipe the contacts with a regular eraser or alcohol and if there are several memory sticks, try to insert them one at a time, each time turning on the laptop.

The key is on the RAM bar. Wipe the contacts to the right and left to the end

If all else fails

In this case, with a high degree of probability, one can judge about the failure of the north / south bridge and / or video card.

For a temporary solution to the problem, some heat the released element with an industrial hairdryer. In this case, it is often possible to bring the laptop back to life, albeit not for long.

Laptop motherboard bridges and video card

The most correct option would be to replace the desired chip with a new one, but this can only be done in a specialized workshop. The cost of such work usually ranges from 60 to 120.

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