The computer turns on just a black screen. Black screen when turning on computer

Suddenly after another Windows startup 7 instead of the login screen account or desktop, a black background may appear with a cursor on it. Before we begin solving the problem, let’s delve into its essence, because even a few template instructions for different cases will not always help.

Most often, a black screen and a cursor on it are the result of a virus or malware. software. This program interferes with system settings, making it so that instead of the explorer.exe process it starts itself or completely replaces the above-mentioned file (many remember the Win32 family of viruses that hid files and directories, replaced them with their own “bodies” and even copied their icons for disguise). After all, he is responsible for GUI Windows: everything the user sees on the desktop, etc.

One cannot help but recall the Avast antivirus, which tends to block system processes, including explorer.exe due to excessive activity when starting the PC.

The likelihood of sudden conflicts between video card drivers and the operating system is low, although if they have been recently updated, it increases significantly. And drivers downloaded from nowhere or the use of driver packs only fuel the situation.

More deplorable will be the appearance bad sectors on the hard drive, and even when they contain fragments system files, the same explorer.exe. We won’t ignore partially damaged RAM sticks either, but last but not least.

First of all, let's try to start the computer in one of the additional boot options - from the last successful configuration. It is a set of system parameters stored in the registry for the state of drivers, applications and services with which Windows 7 successfully booted for the last time. If, before restarting or shutting down the PC, you installed something, edited the registry or the list of automatically launched applications, this method will clearly help. To implement it we do the following steps.

1. Let's reboot.

This is done using the Reset key or through the task manager.

• In the second case (it is recommended to use this one), we call the dispatcher when help Ctrl+ Alt + Del .
• Move the mouse cursor to the “File” main menu item and call the “New task” command.

• Execute the command “shutdown /r” to reboot the system.

1. After the BIOS information appears, click F8 until a menu of additional boot options appears.
2. Using the cursor keypad, select “Last successful configuration” and press Enter.

Did not help? This means the source of the trouble is different. Let's move on.

Avast

If the “seven” is protected by a comprehensive antivirus solution from Avast, the application may be the culprit for the fact that the explorer does not load. Removing the antivirus is not an option, but adding the file with which the problem is occurring to the exceptions is necessary.

It’s not relevant for all versions of Avast, but it’s worth a try since similar behavior has been noticed.

1. Open the Task Manager.
2. We launch the “AvastUI.exe” process, as in the previous case, finding executable file in the folder with installed antivirus(in Program Files).
3. In the application menu, click “Security”.
4. Then go to the “Antivirus” subsection, where we click on the “Behavior Screen” tab.

1. Click “Browse” or enter the path to the reliable process manually - as shown in the screenshot.

1. Click “OK” and restart.

Has the blinking cursor appeared on a black background again? Let's move on.

Manually launching Explorer

There are several simple ways to open the program responsible for the graphical interface on the problematic computer.

1. If we stop at this option, we reboot again, and after completing the hardware self-test procedure, press F8.
2. In the window select “ Safe mode with command line support."

1. In the CMD text line we write “explorer.exe” and press Enter.

If the process does not start, then the corresponding file is damaged, missing, or cannot be accessed.

Rolling back the system, which we will touch on later, restoring the “seven” from the installation flash drive, fighting viruses and their consequences, or editing registry entries will help here. In the latter case, you will have to acquire boot disk with an antivirus program, start from it, selecting CD/USB with the distribution kit in the BIOS antivirus program. Depending on it, the method of starting a scan may differ, but the meaning is obvious: we find and remove all viruses at least on the system volume.

If viruses are annoying

Even a laptop that is not currently infected with viruses can crash, displaying a black screen without or with a cursor. By the way, in the first case, the source of the problem may be the video driver. And all because the virus did its own thing, replacing the path to explorer.exe with its own. It is noteworthy that the following method works even without booting into safe mode, and you can also call the Registry Editor through the task manager.

1. Open the “Run” window through the task manager.

1. We write “regedit” and press Enter.

1. Expand the HKLM branch.
2. Go to the Software section.

1. We follow the path indicated in the screenshot.

1. Open the Shell key editing window.

1. In the “Value” field, set “explorer.exe” and apply the settings.

1. Let's reboot.

If this does not help, you will have to return to one of the previously saved states operating system computer.

Rollback

Here we will engage in time travel, provided that the system recovery function is activated.

1. Through the task manager, open the command execution dialog.
2. We register rstrui.exe and execute the command.

1. We indicate the recovery options (it makes sense to select the last created rollback point before the black screen appeared or stop at the recommended one).

1. Click “Finish”.

1. We get acquainted with the warning and click “Yes”, but there is no other choice.

Once the process is complete, a notification will appear.

The next time you turn on your PC, the desktop should appear.

When the graphics driver is naughty

Rolling back drivers during a system rollback is extremely rare. It’s good if the graphics driver was installed quite recently, but if it was installed a couple of weeks ago, when resuscitating the “Seven”, many files and applications may suffer. Rolling back the driver will help you get rid of such software, and only if the problem does not occur when you start it in safe mode.

1. In the “Driver” tab, click “Roll Back”.

You can also try to remove or update the video adapter driver by downloading it from the official website.

Before this, you should test the RAM sticks using a utility like Victoria 4.47, check the HDD for failed memory cells (chkdsk C: /f) and the integrity of important system resources (command “sfc /scannow”). They are performed through command line.

Black screen after standby

After resuming from standby mode, a black background may appear instead of the desktop or user selection interface. In such cases, there will be several options, depending on the situation:

• rollback or installation more old version graphics driver, if problems began after updating the video card driver, especially when using driver packs or installers downloaded from third-party resources;
• alternately switching between the four main values ​​of the ACPI Suspend Mode parameter (responsible for software control power supply for computer components), located in the BIOS section called Power;
• reinstalling Windows 7 using the original image, and not the next author’s assembly - it is likely that this caused the problem (removing and disabling some system functions to save disk space and facilitate assembly could have had an effect);
• updating drivers for USB controllers, mice and keyboards downloaded from official resource their support;
• disabling the PC to go into standby mode;
• prohibiting one of the input devices from waking up the PC from standby mode.

Let's look at the last option in more detail. You can restore your PC using a mouse or keyboard. It is possible that one of the devices is blocking the computer from returning to a normally functioning state, and this is easy to determine, at least by the increased activity of the fan blades. In this case, deactivating the option to disable sleep mode for the mouse or keyboard will help.

Do not disable it for both devices at the same time, because you will not be able to exit sleep mode later!

Every third laptop owner is faced with the problem of a “black screen” upon startup. There may be a lot of reasons that cause a problem, but before contacting a repair service computer equipment, we recommend that you perform the diagnostics yourself. We will talk about this below.

Causes of malfunction

The reasons why the laptop screen does not work can be divided into several groups:

1. Damage to the southern or north bridge motherboard due to mechanical interference or overheating of the device.
2. Problems with the central processor or video card.
3. Broken cable, laptop matrix or backlight.
4. The RAM malfunctioned or fell out of the connector.
5. Malfunctions in the computer hardware settings.
6. The battery has stopped working.

In the first three cases, repair or replacement of parts is necessary. You can try to fix the malfunctions described in the remaining paragraphs yourself.

Advice! If the laptop turns off after a long time of operation and shows no signs of life, it is likely that it has overheated. Check that nothing is blocking the air outlet, clean it from dust, and then turn it on.

Elimination

Important! Determine whether the laptop starts when you turn on the power button (you can hear the noise of the coolers, hard drive, does it light up? LED indication). Your further actions depend on this.

Battery check

If the laptop shows signs of life when turned on:

1. Connect it to a 220V network, check if there is voltage (look at the laptop charge indication).
   
2. There is an indication, but the laptop does not turn on - disconnect Charger from a laptop.
3. Pull out the battery as shown in the picture.
   
4. Clean clogged contacts.
   
5. Press and hold the power button for 20 seconds to remove any residual charge from the motherboard and laptop components.
   
6. Connect the charger and turn on the device, check the screen operation. If it works, install the battery and check the operation again. Laptop won't turn on? We recommend replacing the battery.

The laptop “comes to life” upon startup and there is a screen at hand personal computer or a TV with an HDMI output - check the operation of the laptop, perhaps the fault is really in the laptop:

Advice! The cause of the malfunction may be an unstable Windows work. If so, or troubleshoot through the command line. Enter the command sfc /scannow

BIOS Settings

Laptop users facing black screen problems were helped by a reset method BIOS settings default. If the computer shows signs of life (the coolers are working), connect it to a monitor or do the procedure blindly:

1. Turn on your device.
2. After turning on, press the F10 key (enter BIOS) for 10 seconds.
3. A menu will open, wait and press F9.
4. Press Enter (return to original settings).
5. Press F10 (exit BIOS)/
6. Press Enter to save your changes, exit, and restart your computer.

Important! If the previous methods were unsuccessful or your device shows no signs of life, try another option below.

Checking RAM sticks

There is a possibility that the motherboard has stopped recognizing RAM(OP):

1. Turn off the laptop and take out the charger, turn it over, unscrew the screws.
   
2. Open the back cover.
   
3. Carefully move the latches in different directions to remove the RAM.
4. Change the connector (if several) or swap the OP.
5. Insert the OP back at an angle of 45% and lightly press from above. The clamps will do all the work themselves.
   
6. Check the connections of other devices (hard drive or SSD stick).
7. Close the lid, connect the device to the network and check its operation.

A black screen when loading Windows is a problem that many users face sooner or later, but not everyone knows how to fix it. What should be done? First you need to study possible reasons. There are many of them and they are different. They can be both technical and software, and sometimes the problem lies in simple inattention.

Problem with wires and/or connectors

A typical situation is problems with cables, connectors and power buttons.

Checking the power supply to the monitor

1. If you have desktop computer, That First check the power supply to the display. Some users get so used to working on a laptop that they don’t notice the obvious when they switch to a desktop. The power button on the monitor is simply turned off. It is no coincidence that the instructions from IBM specialists, developed for the first PCs, included checking the power supply as the very first point.
2. Second common cause If you suddenly get a black screen when you turn it on, the power cable is not connected properly. In practice, there were often cases when the cable plug was loosely held in the socket and was disconnected when the display was moved or the active participation of household members, including furry ones. In the office, poor contact between the cable and the monitor is often caused by cleaners touching the wires while cleaning.

Checking the contact between the video card and the monitor

The second reason for the situation when the coolers work, but the computer does not turn on and shows a black screen, is a problem with the cable between the video card and the display. There may be two options:

• The cable has come out of the socket.
• The cable is not connected to the main output of the video card.

With the first case everything is clear. Just check the integrity of the cable itself and the reliability of its fastening in the connectors. But the second case is worth clarifying. Inspect back panel computer.

If there are two connectors for connecting the monitor cable, then we are dealing with one of the following situations:

In both cases, there are two options for connecting the cable. Turn off the computer, switch the wire to another connector and turn on the computer again.

Perhaps someone simply switched the cable to a different socket by mistake. The modern HDMI connector is not equipped with screws like the old VGA, and it can be accidentally pulled out of its socket and then plugged into the wrong socket or not inserted fully.

Is the screen still black after restarting the computer? You may have a technical problem (more details below).

Remember that whenever you switch the video cable, it is better to turn off the power to the computer and monitor.

“External monitor”

A laptop almost always has an output for connecting an external monitor. Therefore, if when you turn on the laptop you hear the sound of the coolers, but the screen is black, then it is likely that someone switched it to the external monitor mode. Find the external monitor control function keys on your keyboard and try turning on the internal display. Here's what they look like on an ASUS laptop:

The F7 key turns off/on the internal screen, and F8 controls the combination of output to the external/internal monitor of the laptop. They should be pressed together with function key, usually denoted Fn.

This is what the selection of operating modes with an external monitor looks like in Windows 8 and 10.

Switch different modes by successively pressing the key combination Fn and F8 for the keyboard shown above ASUS laptop. This way you can accidentally turn off the internal laptop monitor and get a black screen when you turn it on.

Software problems

Boot Loader Failure

A black screen and a cursor on it after booting a laptop or computer may indicate a failure in the operating system loader or one of the drivers. If the system startup options menu appears, try booting into Safe Mode. And if not, then there is only one way out - . How to make a bootable flash drive is described.

Wrong refresh rate or too high resolution

The second common problem with a black screen when loading Windows may be an incorrectly set refresh rate on the video card. The fact is that old CRT monitors operate with a high screen refresh rate, up to 100 Hz and higher. And modern LCDs can only support 50-60 Hz. This is due to design feature such monitors.

If you get a black screen when switching from an old monitor to a new one, then you need to do the following.

For the same reasons, you can get a black screen on a laptop connected to an external monitor. Try adjusting the frequency and resolution for external display, as shown in the picture above.

Technical difficulites

What to do if you couldn’t overcome the black screen when you turn on the computer using the methods described in this article. Perhaps the reason lies in a malfunction of parts of your PC.

If you are not a specialist in the field of computer equipment repair, we recommend that you contact the service for professional support!

The video card has failed

With such a malfunction, the laptop or PC fan works, but it does not start and we see a black screen on the screen. According to POST standard we should hear one long and two or three short beeps from the speaker(built-in speaker). The specified sound indication is typical for AWARD BIOS installed in many mass-produced laptops and computers.

POST is a BIOS self-test system. We recommend reading the article about.

Just be sure to make sure that the speaker is there and connected to the board. In some modern computers manufacturers do without it, replacing them with LEDs on the motherboard and even small digital indicators. But the latter can only be found in expensive motherboards for overclockers.

The monitor has failed

A malfunction of the display itself manifests itself in exactly the same way, only without sound signals. The computer does not turn on, although the coolers are working, and the screen is black. As a rule, in this case you should also see other signs of desktop activity: the drive’s LED is blinking, for example. You can check whether the display is broken by connecting it to another PC or connecting the computer itself to another display or TV. Many video cards today support HDMI, which is found on modern TVs.

If the laptop does not turn on and shows a black screen, this may indicate a malfunction of the cable connecting the system board and the display. You can check this by connecting the laptop to an external monitor. If there is an image, then the video subsystem is working, but the display or its cable is not.

Again, I’ll make a reservation that we have already discussed in detail all the main points and breakdowns associated with a black screen when loading a computer in the section of our website called “Repairing your computer yourself.” We had separate articles related to, an article dedicated to, an article called "", "", and many others useful information on the topic of self-repairing your computer.

Be sure to read them to fully understand what the main malfunctions of computer equipment are and how they should be correctly diagnosed and repaired. Also pay attention to the article about (its last few paragraphs), which talks about insufficient power of old power supplies, which can lead to a black screen when turning on the computer.

In general, when diagnosing someone else’s computer, always keep the following in mind: I don’t know how one or another owner handles equipment(what is the norm for some may be completely unacceptable for others). For example, I had a case when the owner of the house decorated hers with souvenir refrigerator magnets! Can you imagine what happened to the poor car?! :)

So let's continue. I will describe two of my non-standard cases when when you turn on the computer was black screen. In both cases, the reason was the same - the adhesion of a foreign substance (simply dirt) to the tracks printed circuit board. Only in the first case it was , and in the other - . The result, as you can see, is the same - when you turn on the computer, there is a black screen.

According to one of the “unofficial” definitions: “dirt is any chemical compound found in the wrong place” :) I don’t know what compounds that dirt on the motherboard consisted of, but after removing it with an alcohol solution, the computer started up normally and is still working to this day .

I even managed to take a photo of the second case, which led to the appearance of a black screen when loading the computer. We once bought 10 old PCI video cards for the department at the radio market for the department. They brought it in and started testing it (inserting one at a time into a pre-assembled working configuration). Seven cards turned out to be working, three were not. I turned the last of the non-working ones in my hands, mentally marveling at the sellers who sell faulty devices, and noticed a strange darkening in the corner.

Let's zoom in on the part of the image that interests us for clarity:

You can clearly see the dirt adhering to the traces of the printed circuit board. Remembering my previous successful experience with cleaning, I decided to carry out the same procedure and find out whether this particular substance causes a black screen when turning on the computer?

No sooner said than done! “Mr. Muscle” was at hand, he took it, moistened a lint-free cloth and carefully removed all the dirt from the paths. This is what I ended up with:

I let the card dry, inserted it into the computer, turned it on and everything worked! :) Now this video works successfully on one of our terminal clients.

Conclusion: if you see a black screen when you turn on your computer (especially if it is not your computer), do not be lazy to make sure that its owners are adequate people and do not fill their equipment with sweet syrup (there was such a case) and handle it carefully.

Yourself? Let’s answer this: attentiveness, attentiveness and once again - attentiveness! Here is the advice that will help you avoid wasting your time and nerves, if you need to professionally diagnose its malfunction.

Hi all! If you see a black screen when you turn on your computer, then this is the first sign that there are some problems with its operation that do not allow the operating system to function normally. Windows system. There may be several reasons for this phenomenon, we list them:

• Incorrect shutdown of Windows;
• Damage to the interface cable connecting the monitor or lack of contact;
• Desktop not loading;
• Windows license missing;
• Components not working system unit;
• Problems with software, lack of drivers;

As you can see, there are quite a few reasons why a black screen appears when you turn on the computer, so we will analyze each of them separately and try to troubleshoot the problems ourselves.

Problems booting Windows

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

In most cases, this problem occurs when users unexpectedly lose power and the computer turns out to be de-energized at the most inopportune moment.

In this case, the user will see a black screen when turning on the computer with system boot options.

Here, most often, it is enough to select “Windows Normal Boot” 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 turn on the computer, you must press the “F8” key, the “Additional boot options” window should appear;
• In this window, you can select three “Safe Mode” options. Using it, you can boot the system and fix a 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”

Problems with the cable or monitor.

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. Particular attention should be paid to the connectors. A fairly common reason is the bent antennae of the contacts on VGA cables.

In order to exclude faulty cable, it will be enough to take a replacement and connect.

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

If it is possible to connect another monitor, then by all means take advantage of it.

Windows desktop won't load.

Another fairly common reason why a user sees a black screen when turning on the computer is the desktop that does not load. The problem occurs after disinfecting the computer for viruses. At the same time, the system seems to boot, but the desktop remains empty: no shortcuts, no folders, no taskbar. If you have a similar situation, then do the following:

HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/WindowsNT/CurrentVersion/Winlogon

Black screen when turning on the computer - Windows is not licensed.

For most users, it is a surprise to see a black screen appear on the desktop after updating the operating system. This happens to users of pirated, hacked Windows versions. At the same time, in the lower right corner, near the clock, you will see the inscription: “Your system is not genuine, purchase a license.”

If you encounter this problem, then you have two solutions:

1. Reinstall the system, and after reinstallation, disable the installation of all updates, but then you risk that your computer may be infected with a virus, such as;
2. Purchase a license for your product and sleep peacefully. After all, the computer will receive all the necessary patches and work more stably.

Unfortunately, there is no other way out of this situation.

System unit components are faulty.

Note! Perform all actions with the computer power turned off. To avoid electric shock.

If the above tips did not help resolve the problem, then most likely there is a problem with one of the components of the system unit.

To begin with, you should open the cover of the system unit and inspect the computer components, possibly clean them of dust and dirt.

Also inspect the motherboard for swollen capacitors; perhaps they are the cause of all the troubles. Then, most likely, you will need to replace the unit, namely the motherboard or resolder the faulty elements.

Remove the video card from the system unit and clean all contacts. Perhaps oxidation or dust ingress occurred over time.

RAM can also be the cause of a black screen and the system refusing to boot. If there are several memory modules, then we take them all out and try to connect them one at a time and test starting the computer. If the system starts successfully, we conclude that some memory stick is not working correctly, and we change it to another.

Also, be sure to clean the contacts of all memory modules, perhaps the reason is quite banal, there is no contact between the motherboard port and the RAM module.

Problems with the video card or driver.

In my practice, there have often been 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 whether the image appears on the screen.

A fairly common cause of failure of discrete video adapters is overheating. By the way, if you don’t know what video adapter you have installed, then read the article -.

Less commonly, the image on the screen refuses to appear due to incorrect installed drivers. In order to exclude this problem download the latest driver for your video card from the official website and install. Perhaps the problem will resolve itself.

Let's summarize.

Today we looked at a solution to the problem when a black screen appears when you turn on the computer. I hope the tips described in this article will help you identify the cause of the problem and eliminate it. The main thing is to act slowly and approach things intelligently.