The Monitor Does Not Light Up When The Computer Is Turned On

hardware faults

Despite the fact that it seems to the user that it is the monitor that does not work, and everything is in order with the system unit, most often the problem is in the computer.

In this case, even handed over the device for repair, you can get an answer that it works quite normally.

And buying a new monitor will generally lead to a waste of money.

So, the main reasons that nothing is displayed on the display after pressing the power button may be:

  • Malfunction of the power supply unit of the computer itself;
  • Problems with PC RAM;
  • Problems with the card, with the help of which the system unit and monitor are connected;
  • Incorrect motherboard operation.
  • And finally, another hardware problem. actually a broken monitor.

Image on the monitor NOT turned on.

In each of THESE cases, it is quite difficult to determine the cause of the malfunction when starting the computer. especially for a NOT too experienced user, and not faced with similar situations.

And yet, there are several techniques that can help Not only check what the problem is, but also the degree of its complexity.

As a result, it is possible to determine what will be required to resolve the issue. is it worth trying to do it on your own or not to do without a service.

computer malfunction

A fairly common reason for the absence of an image on the monitor is a computer that did not turn on for any reason.

This happens, for example, when the power supply of the system unit is out of order or its capacity is not enough to support the operability of all systems connected to it (including the card).

It is worth noting that modern gaming graphics cards have power consumption of 150-180 watts, while AMD processors. up to 70 watts.

And, trying to start a PC with a 300-watt power supply (Considering the need for power consumption from the side of the motherboard, hard disk and optical drive), the user overloads the system, and the computer does not turn on.

Although the same PSU is perfect for a nettop with a regular built-in card.

Low-power power supply

A problem with the main power supply is detected by the inscription on the monitor that lights up before it is turned on, and it disappears after just a couple of seconds.

It is solved by replacing this element. a fairly simple procedure that takes several minutes and a new power supply.

If the PC still works, but when the computer is turned on, the built-in speaker sends a signal in the form of a muzzle, the memory is faulty.

You can find out that it is the motherboard that is faulty in the same way as with a faulty power supply. the computer simply does not turn on, and the indicator on the monitor remains on.

Although to clarify the reasons, most likely, you will have to contact the service. But you should NOT give the monitor there, but the system unit.

In addition, you can make sure that the fault in the absence of a signal from the monitor lies on the computer, and not on the device NOT turning on itself, by connecting the monitor to a laptop, a second computer or a player.

This check option is ideal in case of a faulty system unit or incorrectly configured system.

Since both the player and another PC will work with it normally, and the problem will have to be solved with the computer itself.


If the user recently disassembled the computer and carried out some movement of the modules on the motherboard, it is possible that the problem with the monitor actually lies in the graphics card.

The card that was moved when cleaning the computer from dust may NOT work and the monitor, accordingly, will NOT turn on.

To check the board, you will have to disassemble the system unit back.

No result does not necessarily mean that the card is irrelevant to the problem.

You can additionally check it by switching the connecting cable from the monitor to the connector of the second graphics card. in modern PCs, especially gaming ones, there are two of them. built-in and discrete.

A normally working display indicates the need to change the card or temporarily use a second.

Two PC inputs

If there are two cards, the error occurs when the drivers of THESE devices conflict. Disabling the integrated graphics card in the BIOS will help fix it.

Why might the monitor NOT turn on? Common causes

Users do NOT have to wonder why the monitor does not turn on too often. But, if the problem has already arisen, it can be quite difficult to cope with it.

And in such a situation, when the computer is left without the main means for displaying information, you should take as many steps as possible to restore it.

And this can be helped by studying the signs that accompany a device that does NOT turn on. flashing light bulbs, system overloads and even the behavior of the computer itself.

The check will help to find out what kind of malfunction occurred, and help fix it on your own or by contacting the service.

Software malfunctions

If the problem is not with the hardware, but with the computer, it is much easier to fix it. You will NOT have to contact either the service or the warranty workshop.

All that is required from the user. Reconfigure the system or update drivers.

monitor settings

The reason the display is not working may be out of the picture settings. For example, incorrectly set frequency or screen resolution.

You can determine the problem by trying to connect the monitor to a second computer, and get rid of it by resetting the settings after logging in through safe mode, for which you may need another display.

Display setup screen

the monitor does not work when the computer is turned on

Why might the monitor NOT turn on? Common causes

operating system

Displaying BIOS loading when you turn on the computer, and further disappearance of the image may be caused by Serious problems with the operating system.

This situation is caused by viruses that have got on the PC from the Internet or from removable media, and other problems in the operation of system files.

If safe mode or restoring a previous system state of health does NOT help, the OS is reinstalled again.

It will take NOT more than 20-30 minutes of time, and the monitor’s performance is restored automatically.

Although to get some extensions, you will still have to install new drivers.

After completing all the checks and trying to fix the problems on our own, in 90% of cases it is possible to achieve positive results and again Get a fully functional computer on which you can work, play or play multimedia files.

In those rare cases when the issue is NOT resolved, you should contact the masters. but even then all the actions performed were not superfluous, since with their help it was possible to determine which part of the computing device needs to be taken for repair.

Check the hard drive ribbon cable

None of the above helped and your computer screen still won’t turn on? Before proceeding with the consolidated comprehensive diagram, make sure that the cause of the malfunction is not Incorrect connection of the HDD loop. Trace where the wire connects and check how firmly it fits into the connector on the motherboard. Ideally, it should NOT stagger at all. and even more so by itself “jump out”.

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If a problem is found at this stage, reconnect the disk to the second connector (there will most likely be several) and try to start the PC again. Nothing succeeded? Well, by purchasing another train. they are very inexpensive. and start again. Unfortunately, the probability of solving the issue of reconnecting the hard drive is NOT too high. but it is not necessary to neglect it.

Step-by-step instructions for identifying the cause of the problem with turning on the computer screen

To finally answer the question why the monitor on the computer does not turn on, and to get the opportunity to correct the situation, the following instruction with pictures will help. Follow it carefully. and, if possible, do not skip a single step until the problem is resolved:

  • DO NOT drown to unscrew the case and inspect the “fillings” of the PC. First, wait from 2 to 5 minutes: it is quite possible that after the next update or auto-recovery after a failure, the system needs a little “thinking”.
  • If after the specified time nothing has happened, first of all reconnect the display to the second available block; you can check the monitor using a laptop, if the latter has the required input. If the device is now working as it should, the problem is a chipset malfunction.
  • Try turning your PC back on. You hear the usual signal, and the button blinks as before? So it’s about contacts. Do you hear a repeating sound notification several times? Then you need to think about disassembling the system unit.
  • Check how tightly the contacts of the data cable and the power cable (most likely they are separated) are adjacent to the hard disk and, on the other end, to the corresponding connectors. If necessary, remove and reinsert the pins; you can fix them with a small amount of electrical tape.
  • Listen to the power supply: it is usually located at the top of the case. If the built-in fan spins, everything is fine; if the quiet noise of the blades is NOT heard, the power supply is insufficient or not at all. The easiest way out of the situation is to purchase a new block. Also, make sure the plug is plugged into the outlet and the switch on the back of the list is in the desired position.
  • Remove the side wall and see what happens to the card. Carefully remove it (the computer must be turned off), and then remove any dirt and dust particles. Reconnect and try again.
  • Did the previous step bring no results? Then switch from external adapter to built-in one. This can be done by simply inserting the plug coming from the display into a suitable connector and securing it securely.
  • By snapping off one clip after another, Remove the first “memory” plate from the motherboard, then carefully examine it and, if necessary, clean the contacts. Try to connect again. Did not help? Try to start the PC without one of the bars, go through them from the first to the last. Use industrial alcohol for cleaning, not a hard eraser.

The last step Reset the current display settings to the original ones. and if this has not borne fruit either, use it before going to the service center Final advice.

Why the monitor does not turn on when I turn on the computer: what to do, how to find the cause

Hello dear visitors of In this article, we will talk about a common problem when the monitor for some reason does not turn on. Since we already have a page for discussing this problem, which we strongly advise you to also read, we decided to make a separate article, in the comments to which you can always ask a question on your case. So, let’s begin.

Without a turned on, properly functioning monitor, it is simply impossible to work on a modern computer. In extreme cases, you will have to redirect the signal to a Smart TV or some mobile device, but this method is far from always convenient. Better to spend a little time. and find out what to do if the monitor on the computer does not turn on at startup.

The problem is more serious than it seems; further in the article, both the simplest ways will be considered, which an inexperienced user can easily cope with, as well as Extraordinary. perhaps, in order to solve this problem, you still have to contact the Repair Shop. But you need to start acting on your own. and, as usual, from simple to complex.

Reasons why the monitor does not turn on when the computer starts

The good news: in the vast majority of cases, up to 90%, the prerequisite for displaying a no-signal notification is NOT a display malfunction, but a problem inside the system unit. In such a situation, the device turns on normally, the indicator light on the case is on or “winks” and no overheating is noted.

The easiest way to make sure the monitor isn’t the problem is to connect it to a different build of PC. If now NOT the No Signal notification appears on the screen, but a full-fledged picture, the problem is partially solved: now you should pay attention to the motherboard or card. In addition, you should definitely check the quality of the connection of the cable pins: maybe they are loose, oxidized or partially come off. this is one of the most common reasons that the monitor does not show an image, but the computer is working.

Other less obvious reasons that you should be aware of include:

  • Complete or partial failure of the power supply inside the case. The device may or may NOT pass an electric current to the contacts, or, or the latter still does, give too little voltage to start the display.
  • Damage to the terminals of the motherboard. They are not necessarily associated with graphic components: a failure in a system that seems to be not responsible for displaying the image leads to a redistribution of voltage and, as a result, the inability to start the monitor normally.
  • Failure of RAM or graphics adapter. Both elements are directly responsible for the conversion of digital commands and signal shaping, which in the end goes to the screen.
  • Failure of the central processor. In this case, most likely, a malfunction signal will be given even before the OS starts at the stage of enabling the BIOS. Of course, it won’t be possible to fix the problem by simply reconnecting the contacts. you will have to contact the service center or change the element yourself.

Finally, the reason may indeed be the display. Answering the question why the monitor does not turn on, but the processor is working, such a possibility Not only should not be noted. it should be considered first of all.

Make sure the card works

The third most common cause of the problem is adapter problems.

It is necessary to check if the contacts are connected correctly, and make sure that the component is in working order.

This will require:

  • After carefully unscrewing the screws (screws), remove one of the panels of the PC case. the one located next to the card.
  • Turn off the computer. you can do this both now and at the previous stage, but no later.
  • Remove, trying NOT to touch the card itself, except for the sides, the graphics adapter from the slot. DO NOT swing the die, or pull it too much towards you. this can damage an expensive device.
  • Now, to give yourself an answer to the question of why the monitor writes signal comments while the computer is working, carefully examine the equipment. The contacts do not have to be stained, indicating oxidation or burnout. The former can be cleaned off in the same way as described earlier; the latter indicate the need to urgently replace the adapter or at least re-solder the failed elements. We have a separate article on checking the card, but if the monitor does not work, then the check can be carried out only visually or inserted the adapter into another computer.
  • Acting with care, it is best. using a cotton swab or soft brush, to remove both from the connectors and from the adjacent areas of dust accumulation. When finished, you need to make sure that there are NO lint, hairs, pellets on the surfaces.
  • Reconnect the card and start the OS, check if there have been any positive changes.
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Did not help? Then try another option. It is based on the fact that modern PCs have two cards installed by default: the removable one you just worked with, and the one built into the motherboard. The first, as a rule, is much more powerful, copes better with high loads. The second is not as productive and reliable, but it is quite suitable to make sure that the problem is not in the monitor.

To do this, it is enough to disconnect the cable contacts from the first connector and connect them (sometimes, as mentioned, you need to screw them with screws) to the second. DO NOT confuse: if the card is equipped with two inputs, the cord has stopped not in the “alternative”, but in the one that leads to the chipset.

Another situation is also possible: a conflict between the service software of both cards. In this case, either timely updating the drivers will help you (probably, the problem has already been solved in new versions), or temporarily disabling one of them. The latter can, depending on the manufacturer and model, be performed both in a running software environment and from a BIOS.

Pay attention to one more detail. If the removable card is not simply inserted into the slots, but is fixed by means of screws, make sure that the mount is sufficiently securely tightened, and the plate itself is NOT warped under disproportionate pressure. The reason for the impossibility of starting the display can be precisely the wrong fixation. try to weaken or, on the contrary, strengthen it, until the adapter finally fails.

Check the cable connecting the monitor to the card

At the second stage, you need to check how well the pins of the wire leading from the monitor to the system unit are connected to the graphics adapter. This happens much less often, but you should not neglect this possible prerequisite. all the more, the question is solved in the same way as the first.

First, make sure the plug of the VGA, HDMI or whatever cable you are using is snug enough to the input. DO NOT unplug the monitor, move the contacts or, if possible, plug them in with a little more force. If screws are used for fastening, use a screwdriver to tighten them firmly.

If the computer turns on, but there is no image on the monitor, clean the contacts using the same means: ethyl or propyl alcohol, and not too hard an eraser, special cleaning solutions. You can connect the display to a second available output, in particular through an adapter. Fix the loose contacts with electrical tape, due to the peculiarities of the fastening, but it will not work. and it is not recommended to glue them, taking a possible quick replacement.

To make sure that the problem is precisely with the cable, try connecting the display with a second cable. most likely, you will still need to purchase one to ensure the full operation of the device.

See which mode the display is in

Finally, check if your display is running in stock or any “advanced” mode? Modern devices are equipped by default with several presets, and it is the use of one of them that can lead to the impossibility of displaying the image on the screen.

Finding a way out of this situation is extremely simple: find the instructions for your device on the Internet and, following it, Reset the settings to the original ones. Perhaps there is a special button on the case for this; maybe you have to use a keyboard shortcut.

Check the monitor power cord

The main step you need to take to start solving the problem is to make sure that the cable that supplies power from the mains to the monitor is fully functional. Such wires, as a rule, are covered with black colored insulation, are thick enough, they can come off from the monitor connector.

That’s where you need to start: simply unplug the plug and then unplug the plug. Examine the contacts carefully: if they are clean and evenly colored, plug in, using enough force to push the pins back in, the plug to the monitor and try again.

If there are stains on the surface that indicate oxidation, first clean them with a cotton swab moistened with propanol or industrial ethanol. You can use a soft eraser. however, in this case, you need to make sure that there are NO pellets left inside. If on the surface there are NOT greenish, but charred spots, it would be best to at least replace the cable. and it is better to change the contacts on the monitor itself.

In addition, the contacts can become loose. If there is no signal on the monitor, but the computer is working, try either Pulling the metal “frame” of the pliers, or, if for some reason you cannot do this, “roll up” the plug with tape, insulating tape or any other suitable material. Such a measure should be considered only as a temporary measure: think about replacing the cable, and while working in the created conditions, try to move both the wires and the monitor itself less.

And if possible, immediately Try to connect the display via a spare cord. it is quite possible that this option will be the final solution to the problem.

The problem may be in the PC RAM

RAM strips are perhaps an even more sensitive component of a computer than an adapter. The equipment can simply temporarily stop working due to accumulated dust, static voltage, and other unfavorable factors, or completely burn out. then you have to purchase a new die.

A common situation. the computer does not turn on: black screen, coolers are working. It is possible that the reason lies precisely in the RAM. In the first place, the BIOS will signal in the problems, Typical often repeated short squeaks.

In order not to count the number of sound notifications (it may vary from manufacturer to manufacturer), just turn off the PC, open the block, as described earlier, and start checking with the graphics adapter. How to do this is described in full detail in the previous section. Did not help? Switching to RAM. to find several identical dice sticking out perpendicular to the plane of the chipset, and it will not be difficult.

To check and, possibly, finally get rid of the problem, follow the sequence of steps:

  • Carefully, one at a time, “snap off” the RAM connectors and Removing the straps. Do not push too hard or pull on yourself too enthusiastically.
  • Clean the first “memory” from dust and dirt, check the condition of the contacts, and then insert it into place. Repeat all the described manipulations for other plates.
  • Start the PC again and see if the display turns on properly. If the problem was only dust and static build-up, now it will be solved. If the situation “the computer does not turn on, black screen” persists, try the following steps.
  • Remove the first “memory” strip again, and then try to turn on the PC. Does the display light up? This means that the error is related to the die you just removed. and it must be replaced with a new one having similar characteristics.
  • Now try to rearrange any other bracket into the vacant connector, for example, the second in order. PC won’t turn on properly again? Then the problem is not only in the extracted “memory”, but, quite possibly, in contact. Clean it again and try again.
  • Does not help? To compensate for a malfunctioning connector, you can either purchase a “memory” of a larger capacity, or take the PC to the Repair Shop with a request to rewire the contacts.

When performing all the actions described, it is highly recommended to follow the original sequence of placing the dies when reconnecting. The chipset can be very sensitive to the order of connection and refuse to work even if each bar individually is completely intact. In addition, before each new start, you need to check whether the contacts of the RAM are latched.

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Power outages

The most common problem that the monitor does NOT start automatically when the computer is turned on is no power. In this case, this malfunction may be expressed in different ways, but in general, the screen itself will not be activated at all.

In order to diagnose this kind of inoperability without unnecessary problems, pay attention to the power and mode LED indicators. If the monitor somehow shows the presence of mains power, you can go directly to the next method.

In cases where there are simply no indicators on the screen, try disconnecting the monitor cable from the computer system unit. Provided that the device automatically started and presented a screen with an error message, you can safely proceed to considering problems with the card or system settings.

Considering all of the Above, if the monitor is NOT showing signs of stable operation, you should try changing the power supply cable from the monitor.

A situation may arise that changing the network conducts will not bring the desired results, as a result of which the only way to solve the problem is to contact the specialists or replace the device.

In addition to the named malfunctions, it is necessary to make a reservation that the screen can simply be turned off by using the power buttons.

It is very easy to diagnose power outages by following prescriptions. Most importantly, do not forget to check all possible power failures, including both the network cable and the power supply.

Driver problems

In some also quite common cases in PC users, the monitor itself works stably, but sometimes the image is severely distorted, showing various kinds of artifacts. Here, a prerequisite may well be a corrupted or completely missing driver for memory.

Guided by the special instructions on our website, diagnose the system for the lack of the necessary drivers.

Subsequently, download and install the appropriate software for your GPU.

As a last resort, you can use special software from third-party developers designed for in-depth diagnostics of the card for any failures.

Fatal system errors

The last way to solve problems with a non-working monitor is to completely reinstall Windows by using the exact same distribution kit. Here, please note that this approach is a kind of last resort in cases where other methods have not brought the desired results.

To facilitate the process of removing and installing Windows, use the special instructions on our website.

Why the monitor does not turn on when I turn on the computer

Sometimes users of personal computers and laptops have problems with the fact that after turning on the power supply to the PC, the monitor does not automatically start. In this difficulty, there can be a fairly large number of reasons for the occurrence, in which we will try to describe in detail below, focusing on possible methods of repair.

Incorrect monitor settings

Almost any monitor on a personal computer is equipped by default with special settings that allow you to edit some display parameters. It is because of the knocked down settings that the screen may remain off or display a distorted picture during startup of your PC.

To resolve this situation, you should use the technical specification of your monitor and, in accordance with it, reset the parameters to factory defaults. At the same time, remember that such parameters are NOT capable of causing difficulties, since all the necessary tools are located directly on the body and have the corresponding symbols.

In case you cannot take advantage of the specification, we suggest that you Read our special instructions.

In addition, it is important to pay attention to the BIOS settings that allow you to disable the graphics processor built into the motherboard by default. If your computer is equipped with a discrete card, turn off the on-board memory in the BIOS or, alternatively, reset the general parameters.

cable faults

This method is rather complementary as it is partially related to the previous premise of the monitor malfunction. However, in this case, the risk of leaving the screen is much lower than with power supply problems.

The possible problem is that the cable normally connected via HDMI may be damaged. For diagnostics, as well as solving this problem, try replacing the wire connecting the system unit and the monitor.

Be sure to make sure the image cable is securely connected to the correct connectors.

The Monitor Does Not Light Up When The Computer Is Turned On

Sometimes, in the case of connecting a modern monitor to older models of motherboards or cards, it may be necessary to use Special adapters. The reliability of the contact, as well as the serviceability of such an adapter, must be rechecked.

If possible, try connecting another screen with good wires and connection interfaces to the system unit.

Check if the monitor is working properly by connecting it to another PC.

After completing the recommendations and confirming the absence of cable faults, you can proceed to the last possible technical problem.

The monitor does not turn on with the PC

First of all, it’s important to mention that monitors come in a wide variety of sizes and models, but they are all equally prone to the same problems. Thus, this article will suit you regardless of the type of your screen.

All material in the article is provided for solving problems with a computer screen, which previously worked stably. If you purchased a completely new model and after turning on the PC It does not work, you should contact the place of purchase directly with a complaint.

Moving on to considering the causes and ways of solving difficulties with the monitor, we note that you can always contact technical specialists to diagnose and fix the screen. However, this should be done only as a last resort, provided there is no guarantee or after an independent analysis with an attempt to eliminate problems.

Unstable OS

The unstable operation of the operating system can cause problems Not only with the monitor, but also with many other components of the computer assembly. Because of this feature, it is extremely important to diagnose Possible problems in operation in time and eliminate such malfunctions.

An example of a Windows malfunction is when the screen fades before the welcome screen. In this case, the system boot indicator itself, as well as all possible BIOS controls, remain in working condition.

You can get a few more details and ways to resolve this situation from a special article.

In addition to the instructions provided, you should also use the services of checking the operating system for viruses. This is due to the fact that some types of malicious programs are capable of causing a full system boot failure.

In addition, you can use the option to switch to safe mode and from there scan the system for viruses and then remove them using Special portable programs.

Do not forget that difficulties can also be caused by incorrect operation of the system registry.

This can be done with this method, since we have considered all Possible general methods for correcting errors in the operation of the Windows operating system.

Map problems

Conventionally, this problem can be divided into two parts at once, concerning discrete cards and integrated ones. In this case, the approach to diagnosing and resolving a malfunction is usually always the same.

After using the card built into the motherboard, you should switch to using discrete memory as a test. If this is possible, you need to find a suitable replacement for your motherboard, guided by the appropriate instructions.

If you have difficulty connecting the monitor to a discrete graphics processor, then you should disassemble the system unit and carefully examine the card connector. Inspecting and cleaning the connector pins of the card, and installing it correctly, can help resolve screen issues.

This is where we can finish this section of the article, since if the problems persist, the only solution would be to completely replace the card.

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