I turn on the computer black screen and the system unit is working

Cable or Monitor Problems.

Sometimes there are cases when the cable connecting the monitor to the system unit fails. In this case, it is necessary to inspect it for damage. Pay particular attention to the connectors. A fairly common reason for the bent tendrils of the contacts on VGA cables.

To exclude a faulty cable, it will be enough to take a substitute and connect.

If everything is fine with the cable, then we check the monitor. To begin with, pay attention to the power indicator (light on the monitor panel). If the indicator is on, then the monitor is powered, if not, then we look at the power wires. Perhaps they are not connected to the network or some contact has moved away.

If possible, connect another monitor, then be sure to use it.

Restore system files

As a result of the loss of part of the operating system files, it may work unstable, in particular, not loading the explorer, leaving us with a black screen.

To check the system for the presence of damaged files or their absence, run the command line as administrator and enter the command:

Video card or driver problems.

In my practice, there were often cases when a black screen appeared when the computer was turned on due to a faulty video card. Since many modern PCs are equipped with a discrete and integrated graphics adapter, you can simply connect the monitor to the built-in video adapter and check if the image appears on the screen.

Overheating is a fairly common cause of failure of discrete video adapters. By the way, if you are not aware of what video adapter you have installed, then read the article. How to find out the video card of your computer.

Less commonly, the image on the screen refuses to appear due to incorrectly installed drivers. To eliminate this problem, download the latest driver for your video card from the official website and install. Perhaps the problem will be solved by itself.

Reinstall Windows

If the previous options did not help to solve the problem, we reinstall the system.

If you have valuable information on the disc, you can boot from the Windows LiveCD and copy the data to external media. After reinstalling Windows.

Removing updates or rolling back the system

a) remove the latest fixes. To do this, open the Control Panel (control command or use the Windows search). Programs. Programs and Features. Installed updates:

We sort the updates by installation date and remove the last ones installed:

the list of updates is divided into categories, which makes sorting not logical, so you have to scroll.

b) roll back the system. Read more in the article How to roll back the system

Windows startup problems

Probably the most common reason for a black screen is a failure to boot the operating system. Very often it occurs when the system is shut down improperly or the boot area is damaged.

turn, computer, black, screen, system, unit

In most cases, this problem occurs when users have unexpected power outages and the computer is de-energized at the most inopportune moment.

With this outcome, the user will see a black screen when the computer is turned on with the system boot options.

Here, most often, it is enough to select the item “Normal boot Windows” and wait for the system to start.

If the system does not give you a window with boot options, then you need to do the following:

  • After you have turned on the computer, you must press the “F8” key, the “Additional boot options” window should appear;
  • In this window, you can select three options “Safe Mode”. With it, you can boot the system and fix the problem that arose after an unexpected shutdown of the PC, incorrect installation of software or viruses;
  • If you are sure that everything is fine with the computer, then select “Normal Boot”

Anti-virus scan

We check the computer for viruses. To do this, you can use one-time utilities, for example, CureIt.

Black screen on windows startup FIX

Disable Fast Startup or Hibernation

Fast startup allows you to save the state of the system, which in turn allows it to boot faster. In some cases, such a start of the system can lead to problems of a different nature. They are solved by disabling the quick start mode.

We do the necessary settings in the command line. First, we try to disable hibernation mode:

and restart your computer. If it boots normally, you can try hibernating again with the command:

If disabling hibernation did not solve the problem, try disabling Fast Startup. In Windows 8 and earlier versions of 10, this could be done in the power settings. In new versions, only through the registry, so we will analyze this particular method, as a universal one.

We start the command line and enter the command:

reg add “HKLMSYSTEMCurrentControlSetControlSession ManagerPower” / v HiberbootEnabled / t REG_DWORD / d 0 / f

with this command, we set the value for the HiberbootEnabled parameter in the HKLMSYSTEMCurrentControlSetControlSession ManagerPower branch.

The computer beeps and does not turn on

Determine the name of the BIOS developer company (see How to enter the BIOS) of the motherboard (from the technical documentation).

In AMI, 5 short beeps means a problem with initializing the socket, the problem lies in the processor.

Whereas in Phoenix. a breakdown of the hard drive (or an SMD component that supplies power to it).

8 short (or 1 long and 3 short) in AMI. a problem with turning on the video card. In Award, a similar error is indicated by 1 long and 2 short beeps, in Phoenix. 3, 4.1 short “squeaks” with a break of 2 seconds.

Two short beeps on motherboards (except for outdated Asus) inform about a problem with RAM (the image appears, at least. the manufacturer’s logo).

The absence of signals indicates problems with the power supply or the processor (perhaps they changed the thermal paste, and bent the petal on the contact pad).

If the computer beeps and does not turn on, troubleshooting is performed in service centers with a test POST card (connected to the PCI bus).

What each of the codes means is indicated in the technical instructions.

Why the computer won’t turn on

If the computer does not turn on or the OS does not load, there are several reasons for this.

  • software (operating system initialization error);
  • hardware (breakdown of a specific device).

It is easy to cope with software on your own, without resorting to the help of specialists, while difficulties arise with technical ones. The main task to be solved in such a situation is to identify the cause of the problem.

Perhaps the power button is stuck, the power button is out of order, or the wires coming from it have moved away from the contacts on the motherboard.

To check, we disconnect the wire labeled “Power SW” from the motherboard and close the contacts in this place with tweezers (imitation of pressing a button).

We check the power supply. disconnect the PC from the outlet, disconnect the wide 20/24 pin connector from the motherboard, connect it back to the mains and close the 4 and 5 pins with a paper clip.

If the power supply unit is working properly, the cooler will start in it (if you have a multimeter, measure the voltage at the outputs by comparing with the screenshots).

I turn on the computer black screen, and the system unit is working

Recently, a strange incident happened, a friend asked me to look at the computer, she says I turn on the computer, the black screen, and the system unit is working, but the monitor gave out the inscription there is no video signal, hmm, strangely I think, well, since there is no video signal, then the first thing to do is to check the video card, remove the video card, purge. I put the same thing back into the board, by the way, how to pull it out and insert it back, see the manual to change the video card.

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Well, I think once the same thing, I’ll try to remove my video card and put it in a friend’s system, took off mine, put it in the system, turn on the computer, the black screen again, and the coolers work, but there is no picture, again I was surprised I thought there might be problems with the pci connector, means to check I certainly don’t have such a breakdown, well, I’m going to insert my video card into my PC, insert it, turn it on, and I’m very surprised now I have a black screen, and the system unit seems to work and there is no picture, well, I think it’s like a virus.

First of all, I decided to try to boot from some live CD, insert the disc, nothing happens, the computer does not even show the motherboard splash screen, well, I think the virus sits somewhere in the memory and I transferred it through the memory of the vidyuhi, although I did not believe much in it. but on the other hand, the computers did not have any contact, I think, but should I try to install another hard drive, since I had 3 of them nearby, I take the first one that came across, take out my hard drive, insert another and oops! The splash screen of the motherboard appeared and the PC gives a picture on the screen, then I took another hard drive and tried it with it, the computer turned on again and started to boot, and I decided to put my hard drive back on from this computer, put the computer on, the problem disappeared.

I did the same on the computer of my friend, I just turned off the power from the power supply unit, turned off its hard drive and put everything back again and the problem also stopped, the computer started to boot normally again, it seems to me that the malware was just in the hard disk buffer and turning it off completely and plugging in the buffer again dropped and the hard started working again, I didn’t bother looking for more details and searching for malware because I didn’t want to, the main problem was fixed!

So, if you turn on the computer, you have a black screen and all the coolers are working, and the monitor displays no connection, then try to do the same as I did, the problem may be eliminated!

The main causes of the malfunction

Video card. loaded element, it often fails for fans to play dynamic shooters. They pull out the board and try to start the computer on the internal graphics module. The launch is controlled by digital indicators. Difficult to diagnose faults with BIOS and motherboard bridges.

Black screen of the monitor when the computer is turned on. Possible reasons

When you turn on the system unit, everything seems to work, and the screen is black.

Hello! The reasons why, when you turn on the computer, instead of the desired and familiar screensaver of the operating system, a black screen appears. Can be very different.

First, no matter how ridiculous it may sound. check if the monitor itself is turned on. in the network or a button on it. Perhaps someone accidentally passing by pulled the cord and it disconnected. Or someone close to you just turned off the button on the monitor.

If everything is in order with the wires and buttons, the problem may be that your system unit urgently needs cleaning from the dust accumulated in it. How to do it yourself at home, without contacting service centers, you can read and look at the following link https://vdblog.ru/kompyutery/pyl-vrag-kompyutera.html

To exclude damage to the monitor itself, you will have to connect your system unit to some other monitor. If at the same time everything starts to load properly, then the problem is in the monitor itself. In this case, either contact the workshop or replace the monitor with a new one. Just in case, when connecting the system unit to another monitor, in order to make sure that the problem is not in the system unit, work with another monitor for a while.

Also, there may well be problems with certain components of your system unit, motherboard, RAM. To check this, the components are usually removed from the faulty computer in turn, replacing them with those that really work, and the faulty part is calculated by the method of elimination. Naturally broken thing must be replaced with a serviceable one. If you yourself do not understand anything about this, then contact the professionals.

A breakdown can also be in the power supply of the system unit. In this case, the computer itself can turn on. To make sure what exactly is broken for you, you need to try to connect another monitor to the computer and see. If that monitor works, it means that your monitor needs repair. If that does not work, therefore, the power supply has flown. But if the monitor screen remains black, then this is a clear sign of a monitor breakdown.

In addition, the hard drive could break or for some reason the operating system itself “flew”.

Also, some users of computers with Windows 7 installed on them often complain about this problem. If you are one of them, read the following link https://www.dsg-network.narod.ru/oTVety/blue_screen_of_death_in_windows_7.html “How to eliminate the black screen of death when you turn on your computer or while working in Windows 7”.

As you can see, there are many possible reasons. You need to find out everything on the spot.

  • 5 Ways to Improve Your Computer’s Performance To measure performance, use the Windows Performance Index. In Windows 7, it is checked in the “System Information” window, in new versions of the OS in the command line. For []
  • 4 Ways to Know the Characteristics of a Computer Knowing the characteristics of a computer will allow the user to understand how comfortable it will be to use this device and what functions it can perform. Knowledge of computer characteristics []

The computer does not turn on, the screen is black, the coolers are working. Causes, problem solving and recommendations

Often gambling addicts face a problem: the computer does not turn on, the screen is black, the coolers are working. The problem occurs after mechanical shock to the case or due to other factors. With such signs, we can say with confidence that part of the power supply circuit is exactly whole.

Additional measures

Often the unit does not want to start due to a malfunction of the start button. But in the first seconds, the fans start up, stopping chaotically. The result of the “law of meanness” is the burned-out south bridge of the motherboard. He is responsible for the communication of slots and the processor with the north bridge. Such cases occur due to improper connection of devices or flash drives through the USB connector.

The latter option will lead the user to an electronics specialist. Only he will be able to remove the faulty element. But the repair procedure is costly and it will be difficult to control the correctness of the actions. Therefore, it is recommended to contact service centers where the whole process is debugged to the smallest detail.

Before seeking qualified help, you should try to clean the fans from dust, inspect the wires for bends and open the insulation. Also disconnect the start button from the motherboard. Then there is a chance the PC will work.

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The computer turns on but the monitor does not work.

Why is my computer monitor not working? It is difficult to answer this question in one sentence, since the links of the chain and their interconnections, which are involved in displaying the picture on the monitor, are quite confused and intertwined. The loss of a picture on a computer monitor can be caused not only by an inoperative monitor, but also by the video signal conversion system itself, and its transmission from the computer to the monitor. Problems with the functioning of the computer’s video system can be caused by a malfunction of the monitor, video card, breakdown of the motherboard, incorrect installation of drivers or incorrect settings of the video system parameters. In this article, we will try to figure out what problems the user has to face if the computer seems to turn on, but the monitor screen does not show anything.

If the screen is blank after turning on the computer. then first of all check if the “Power” button is pressed and if the indicator on the monitor panel is on. Sometimes users accidentally turn off the monitor with a button on its panel, and since it almost never turned off with a button, they forget about this property of the monitor in general, and think that the monitor is broken.

If at any position of the monitor on / off button the indicator does not change its color or does not light up at all, then the problem is clearly in the monitor. The maximum that can be done in this case. check the operation of the power cable (it is best to take a known worker from another device). You can try to use the cable from the computer itself, after turning it off with the button on the power supply. Before powering off the computer, turn it off by holding down the “Power” button on the front side of the system unit for 5 seconds. This shutdown is softer and preferable. After that, you can flip the toggle switch on the power supply itself from the back of the system unit. It should be noted that some computer power supplies are not equipped with a power off toggle switch, so it may not be on the back of the computer. If changing the cables did not help to light the “Power” button, the problem lies inside the monitor case and it is better to immediately contact a service center for repairing monitors.

If the indicator responds to switching on, but the image does not appear, note whether the color tint of the monitor screen changes when the “Power” button is turned on. In operating mode, a few seconds after switching on, the absolutely black LCD monitor becomes slightly brighter. The change from black to dark gray, also almost black, but lighter, is clearly visible if there is no light in the room where the monitor is installed, that is, it is dark. Check the brightness and contrast levels. Sometimes, because of these levels, the user does not see the picture and thinks that the monitor is broken, and someone just joked about it, removed all levels to zero. For some monitors, when turned on in the absence of a video signal from a computer, a standby message about no signal pops up.

If your monitor shows signs of life when turned on or shows standby messages about the absence of a video signal from the computer’s video card, that is, the monitor works, but does not show the usual pictures of BIOS loading or Windows loading, the following malfunctions are possible:

The video signal cable of the monitor is out of order, so the monitor does not turn on, but the system unit works. A signal is not fed to the monitor via the VGA cable, and the monitor, not seeing the signal from the computer, accordingly does not turn on the screen and does not display anything. Carefully inspect the cable that carries the signal from the system unit. Pay particular attention to the pins on the connector. they often bend and cause signal loss. Use the utmost care when aligning the bent pin. they break very easily. Again, try using a working video cable to connect the problem monitor. When replacing the cable, be sure to turn off the computer and monitor completely respectively.

Classic VGA 15-pin cable (D-Sub 15).

The monitor does not light up when the computer boots up and at the same time there are two video cards installed in the system unit. If the system has two video adapters, that is, two video cards, try connecting the monitor to a connector on a different video card. There is a possibility that the primary device where the video signal should be output is incorrectly specified in the BIOS settings. The number of video cards in a computer can be easily determined by counting the video outputs on the back of the system unit. The option where to route the video signal can be changed in the BIOS settings.

Two video cards.
Rear view of the computer.

There is no image on the monitor. because the video card is faulty. It is easier to check the performance of the video adapter by connecting it to a known working system unit, to a working motherboard. Some of the malfunctions are determined by computer self-diagnostics (POST), as evidenced by a series of beeps after the computer starts. If, after inserting the tested video card into a working system unit, the BIOS test emits a series of beeps, therefore, the video card is faulty. Be careful before inserting the video card under test into a working system unit, not all video cards are the same and not all are suitable for different motherboards in terms of connector type. Make sure that the video card under test is supported by the donor system unit. To do this, you can read the description of the motherboard and video card on the manufacturer’s website or in the booklet that comes with the motherboard.

The monitor may not work if the computer motherboard is faulty. If the motherboard fails, the POST procedure (initial test of devices when the computer is turned on, when the BIOS starts up) may not pass and not give any signals. The successful completion of the self-diagnosis procedure is usually indicated by one short signal from the built-in speaker, if it is not there, then most likely the matter is in the motherboard. If there are no signals at all, no, not a short signal, not a series of signals indicating the absence or malfunction of the video card, then most likely the motherboard itself has broken. If the motherboard breaks down, the computer coolers can rotate properly, emitting the seemingly correct operation of the system unit. If the motherboard breaks down, most likely only a computer repair service will help.

The monitor does not turn on although the computer is noisy when turned on. There may be a problem with the processor. If the processor fails, there is no image on the monitor when the computer is turned on, but the coolers spin regularly, as if the computer is working. The motherboard may emit a certain series of beeps, informing about an inoperative processor, or it may not, here, once at a time it is not necessary.

This is how your computer turns on, but the monitor does not show an image. At the same time, you are confident in your abilities and you have experience in computer repair, you can imagine how the computer works and what part of it is responsible for what, then you may well try to repair it yourself, without the help of a computer service. But if you are not confident in your actions and do not understand well what you need to notice in the system unit, then instead of repairing or replacing one part of the computer, you may have to repair two, or maybe three or four parts that you will damage by your inept actions.

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A very common reason is that the system unit turns on, the fans work and make noise, but nothing happens on the screen. The problem arises from the oxidation of the contacts of the RAM. Remove the side cover and pull out all memory sticks.

We take a regular rubber band and thus clean the contacts. If the elastic is not at hand, then it can be lightly scuffed with any sharp metal object, such as a paper clip or pin. But do it as carefully as possible.

Next, insert it back into the motherboard and turn it on. If the system manager is stupid again, then the problem may be in one of the dies. We take out everything and try to insert one by one. our task is to find the “culprit”. The problem plate should be replaced.

The computer does not turn on, but the fans of the system unit are working: 5 reasons and solutions

Hello everyone! Today I ran into a problem when the computer does not turn on, the coolers work, and I see a black screen for no apparent life reason. Since I often face such problems at work, I decided to write more detailed instructions on how to solve this problem at home.

There is no reaction

If you try to turn on the computer, but there is no reaction at all, that is: it does not beep, the screen does not light up and nothing beeps, then there may be several problems at once. First of all, check that the system unit itself is connected to the outlet. We also make sure that the surge protector is turned on if the computer is connected through it.

Look behind the unit itself and see that the power supply is active, and the toggle switch is in the “On” position (stick).

We remove the side cover of the system unit and check the power circuits from the main unit itself. See to have the motherboard turned on. There may be a problem with the power button. Then you can try to turn on the computer through a circuit on the motherboard. On the “mom” find in the lower right corner such a block. On it you need to find two contacts that go to the front cover of the system unit. This is where the button connects. If not enabled, connect.

If it is connected, then you can try to activate it with a regular screwdriver. Look for contacts with the name: PSW, PWRSW, PWR, PWR BTN, ON / OFF, or Power SW. Just touch these pins with a screwdriver. If the fans do not start buzzing and nothing happens, then most likely the problem is in the motherboard or in the power supply. they will need to be changed.

Monitor check

Make sure your monitor is turned on by pressing the power button with a circle and a stick. If the monitor does not turn on, also check that it is plugged into a power outlet. There may be a problem with the outlet or with the socket in the surge protector, you can try another connection.

If the monitor is working properly, and it turns on quietly, then make sure that the correct input is turned on. As a rule, there are several of them on the monitor: DVI, HDMI, VGA. Find the “Source” button and switch the outputs on the PC. Check that the cable from the video card to the computer is firmly inserted both on the monitor itself and on the PC.

The problem could have arisen due to a broken video port. You can try and connect to another output. You can also try using a different wire or even a different connector: HDMI, VGA or DVI. An external video card could similarly burn out, if you have a video output on the motherboard. connect to it. If you have other external monitors connected to your video card or laptop in addition to the main screen, disconnect them.

Check that the video adapter itself is firmly seated in the motherboard and that the power is in place. Alternatively, you can try to take alternative wires from the power supply and connect them to the video.

Check immediately that all the wires from the power supply are in place and that the motherboard, video card, hard drives, drive and other adapters are connected.

How to understand what the problem is?

If at startup you hear that the system unit beeps, then know these special signs that your motherboard wants to give you. The decoding of the signs can be found in the manual for your motherboard. There is a lot of information on the Internet for this reason, but it is the BIOS version that is indicated there. But how to understand which version you have if the computer does not turn on? But precisely, that in no way, and therefore it makes no sense to look at all these meaningless tables. Therefore, you can do this.

  • Find the full name of the motherboard on the board itself.
  • If you do not have a paper manual, then we are looking for it on the Internet by name.
  • Next, we find the decoding of the signal in the desired table.

If it does not beep at all, but turns on, hums and makes noise (or you hear one short squeak), then the motherboard cannot identify problems. Check the monitor and its connections again.


  • Failure or breakdown of the motherboard.
  • Monitor or cable problem.
  • Burned out video card or dedicated video output.
  • Oxidation of contacts of RAM or in power circuits.
  • The power button does not work. when the system unit does not turn on at all.
  • Burnt out power supply.

Similarly, there may be different symptoms when the PC turns on, the fans are spinning, but it beeps, or vice versa does not beep. It happens when the PC does not work at all and the signs of life do not drop. We will talk about all this below in the article.

Nothing helped

Try to completely de-energize the system unit for about 1-2 hours. Unplug it from the outlet. This also applies to the monitor. The startup problem can be in several places:

  • Motherboard.
  • Power Supply.
  • Video card.

To test the last two, you can replace them with workable ones if you take them from a friend. The motherboard will be more difficult. Alternatively, you can take the system engineer to the service center so that they tell you the exact reason there.

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