What to do if you turn on the computer

If the monitor does not turn on when the computer starts, the reasons may be different. Not only beginners, but also experienced users may find themselves in a state of stupor, having fallen into a similar situation. What to do? How to identify the source of the malfunction and eliminate it?

What to do if you turn on the computer

The monitor is not to blame!

No matter how strange it may sound, but in 9 cases out of 10, the screen has nothing to do with breakage. It continues to work, the power button may blink, as if the device is in standby mode. But the image is not displayed; instead, the inscription: “No Signal” is visible. This indicates that no data is coming from the system unit.

What do you need to do first? Be sure to check the connection. One end of the VGA / DVI / HDMI cable may have dropped out of the socket. Or maybe someone intentionally decided to hurt you and pulled out the cord. Alas, this also happens.

The following are other common reasons why the monitor does not turn on when the computer starts:

  • The PC power supply is damaged (it does not work at all or its voltage is not enough to meet the needs of the system);
  • Malfunctioning RAM;
  • The adapter has failed (contact clogging is also possible);
  • The chipset is “covered”. A rare situation and very sad;
  • The problem is really in the monitor.

This is all good, of course, but I’m sure you are more interested in specific steps to eliminate the defect. Here you need to pay special attention to detail, because you have to accurately identify the source. And any signals that the computer will send will help in this. Now let’s move on to a detailed analysis of the solutions.


Diagnosis and “treatment”

The fact is that there are situations when the system does not start immediately, but for a long time “thinks”. But then (after 2-3 minutes) a picture appears on the screen, the download continues. Therefore, it makes sense to wait a bit. If on the screen it says “There is no signal” and nothing happens within a few minutes, you should go to active actions.

You do not need to immediately remove the housing cover and look for a breakdown with your eyes. You must first narrow down the “circle of suspects”:

  • You can exclude the monitor from the list of reasons in a simple way: connect it to another “system”, a laptop. If the image appears, then we continue to search for a malfunction inside the PC.
  • Press the power button on the system unit. Have you heard the characteristic squeak that was before during a normal PC startup? If there was nothing, it means a problem, definitely, inside the computer.
  • Check the cable with which the hard drive connects to the chipset. Both ends must fit snugly into the slots. At the same time, look at the power cable connected to the HDD.
  • Pay attention to the noise of the fan installed on the power supply. Is he present or not? If only silence, no hum. Then BP is non-working. But there is another, very commonplace reason: someone disconnected the power cable from the network or pulled it out of the computer. If there is a power button on the back of the chassis, it is also worth checking.
  • If your motherboard has an integrated graphics card, try connecting to it. Suddenly the monitor “comes to life”, which means that the defect is connected with a discrete adapter. You should remove the cover and see if the cooler rotates on it (if there is one). Perhaps the board is a little off or the contacts are dirty. Carefully pull it out of the slot, clean the contacts with cotton moistened with alcohol (or with an ordinary eraser). Did not help? So the graphics card needs repair / replacement.
  • Often, the monitor blinks or does not work during computer startup due to RAM slots installed on the motherboard. Maybe one of them “burned out” or moved away a little, the contacts got clogged. It is necessary to pull out, try to swap the strips, clean them with an eraser, as is the case with the card (see above).

I am sure that you were able to identify and eliminate the trouble. Is the monitor working? Share your story in the comments. If the steps listed in the instructions did not help, it is likely that you will have to carry the computer to the service, since you are dealing with a hardware malfunction. At home, without a special tool and experience, it is better not to take any action.

Read how to fix Windows 10 black screen problem. Possible causes and solutions. If you encounter a black screen problem in Windows 10, 8 or 7, then there are 2 different scenarios that will help determine the cause of the error and fix the problem.

In the first case, you can go to your computer, but you do not get any image on the screen after login to the system. In the second case, you cannot even enter the computer. The article will tell you how to fix a black screen error after entering Windows, loading the system. We will consider options both with and without the mouse cursor.

Disconnecting external devices

To solve the problem, disconnect all external devices and restart the computer. This primarily relates to devices such as a second monitor, projector or television. If the computer or laptop displays the boot process, then one of the external devices was causing the problem. If the error disappears, then connect external devices one at a time until you again get a black screen. After that, remove the last device that you connected and again make sure that the monitor is working.

Do not use the problem device until you receive an answer to the current problem from the manufacturer.

Black screen after logging into a Windows computer (no screen connected)

The first scenario that will be discussed is a black screen that occurs after logging in.

Force Launch Explorer

Perhaps this will solve the problem.

Switch to Safe Mode

If removing external devices does not resolve the issue, go to safe mode.

  1. Reboot the computer.
  2. On the lock screen, tap the power icon to the bottom left of the screen.
  3. Holding Shift, Press Reboot.
  4. After the reboot, you will receive additional boot options. Select Safe mode with command line support.

Perhaps instead of rebooting, you will be presented with a screen with 3 options to continue:

  • Continue loading Windows 10;
  • Troubleshooting;
  • The completion of work.

Then click on Troubleshooting, then on Additionally. Then click on Launch parameters and then reboot in safe mode with command line support.

After booting in safe mode:

    Check if the display is configured on another device.

    Click Windows p to launch a panel with projection options.

    Will appear on the right Side panel with a list of displays connected to the computer.
    Select the option to output to the current computer monitor

    Reinstall the monitor driver. Open device Manager and uninstall the display drivers:

    • Right click on the button Start, then left by device Manager.
    • In the device manager window, find and expand Monitors.
    • Click right click to monitor, select Delete.
    • Reboot to reinstall the driver.

    Black screen when you turn on the computer (without the ability to log in)

    If the black screen appears before the login window, you will not be able to boot in safe mode as described above. To enter the system you will need a bootable DVD drive or a USB flash drive with a Windows distribution. You can also create a recovery disc on another working computer with Windows 10.

    • Connect the bootable media to the computer;
    • Set the boot priority from the desired media in the BIOS;
    • Boot up the computer.
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    After the download, you can try to boot in safe mode and carry out all the same actions that we considered in the previous paragraph. To select Troubleshooting, then Extra options, then Download Options and then reload in safe mode with command line support.

    If the problem could not be solved, you can try to reset Windows to its original state and conduct a clean installation of the system.

    I do not want to be commonplace, but the so-called “black screen problem” when the operating system boots after turning on the computer. One of the most common problems owners of both desktop computers and laptops face. An operating system that does not boot or a hard disk model does not matter much when diagnosing a problem. On how to remove the black screen when loading Windows 7, Windows 10 on a computer and laptop, the reasons for the failure, we will describe further.

    This manual will be supplemented, so do not hesitate to ask questions, I will clarify the technical aspects as much as possible and solve your problems with the black screen.

    The most likely causes of a black screen when loading

    First you need to list the most common problems that cause a black screen, after which the operating system does not load (in other words, when you turn on the computer, a black screen). In rare cases, after loading, the user sees not only a black screen, but also a cursor. Causes:

    1. Operating system conflict, which is why it cannot load the graphical environment normally.
    2. driver problem (incompatibility with the current operating system: for example, Windows 10 or Windows 7, up to XP)
    3. Failed hard drive on a computer or laptop
    4. Windows OS crashes and does not load correctly (not in safe mode)
    5. Other hardware problems or system conflicts
    6. Windows cannot wake up

    Starting Windows in safe mode on a computer

    One of the most likely reasons why Windows or another operating system does not boot. System conflict, due to which the OS cannot work correctly after turning on the PC. This can be caused, for example, by the fact that the user installs an incompatible program or drivers that conflict with Windows, and when you turn on the laptop / PC, the conflict will make itself felt in an unpleasant way. In the form of a black screen. How to remove it?

    Fortunately, Windows developers have provided the ability to safely enter the operating system, which is designed specifically to fix various compatibility issues. Entering safe mode, you can remove all problems on the computer, resolve conflicts, and then load Windows OS in normal mode.

    So, to enter safe mode on your computer:

    1. Remove all media and devices from the computer that may affect the loading of Windows (flash drives, disks, etc.)
    2. Restart or turn on the computer, depending on its current state.
    3. To enter safe mode, hold down the F8 key during boot. If there are several operating systems on your PC (laptop or desktop), then select the appropriate one from the list and then hold down F8 again to switch to the safe boot mode for Windows.

    Further, in the boot options in safe mode, you can select one of the items and solve the problems of a black screen on a laptop or desktop computer.

    Problems with the monitor or accessories

    The reason for the black screen may lie on the surface: the monitor does not work. This may be due to the fact that the contact between the monitor and the card has disappeared or the power cable is damaged / not plugged in. Therefore, be sure to check the connection.

    As for the laptop, it is unlikely that the matrix “fell off” from the motherboard. To disable it, you need good reasons: for example, a mechanical effect on the display. At the same time, you will see that there are obvious damage on the screen: scratches, broken pixels and so on.

    In addition to the monitor, we advise you to explore the system unit. Check if the card is fixed in the corresponding socket of the motherboard, whether there is a voltage supply to all components of the PC. This should be done only if you have the skills to assemble / disassemble a computer / laptop.

    Conflict resolution with driver, if the computer does not start, a black screen is displayed

    An example of a similar problem:

    If you think that the black screen problem may be related to the conflict of the card drivers on the computer or laptop, then:

    1. In the safe boot menu, select “Enable low resolution mode”.
    2. After successfully logging into your operating system account through the device manager or Control Panel, remove the conflicting ATI / NVIDIA driver.
    3. Restart your computer
    4. There may be a conflict between the drivers of the motherboard and the card. You need to try different combinations of drivers. In order not to reinstall Windows each time during experiments, create a restore point and, when a black screen appears, roll back to the previous restore control point.
    5. If the OS boots in the normal mode correctly (the Desktop and the Windows cursor appear), then the black screen problem is really associated with incorrect behavior after installing the drivers. Go to the website of the card manufacturer and download the latest version to your hard drive, try updating the driver again.
    6. If the black screen continues to appear, try the other solutions described in this guide. E.G. Delete “harmful” programs.

    We remove programs that conflict and block OS loading at startup

    In this case, the sequence of actions to resolve the problem will be approximately the same as in the above case. The only thing that in safe boot mode Windows you need to specify “Enable Safe Mode”. Next, in this boot mode, you need to go to the control panel and in the window “Programs and Features” Sort by application installation date. Analyze what you installed recently: it is possible that conflicting applications are the cause of the black screen and inadequate loading of Windows from the system drive on your computer. One of the best programs to uninstall applications. Free CCleaner utility.

    Disable unnecessary programs and services from Windows startup

    There is a wonderful utility msconfig, with its help you can speed up loading Windows. Although modern computers load the OS quickly, optimizing the download can remove the black screen for a few seconds.

    1. Start. Run. In the window, enter msconfig.
    2. Services tab. Here you can disable unnecessary services.
    3. Startup tab. To enable / disable programs at boot.

    In Windows 10, startup items can be disabled through the task manager (Startup tab). The status column displays the application status.

    We use a recovery point to roll back the system on the computer and fix problems on the computer

    It happens that it is impossible to identify the cause of the OS failure, uninstalling drivers and programs that cause conflicts does not help: anyway, when the computer boots up, a black screen appears.

    What to do with the problem? Reinstall the operating system? If Windows is still loading when you turn on your computer, do not rush it “bury”. For starters, we recommend that you try to roll back the Windows operating system using the recovery point (you can do this by booting in safe mode). For more information on how to roll back the system, read the link.

    If the computer does not start. Use the previous Windows restore point

    Use boot disk (Live CD) to fix errors and diagnose black screen

    When a black screen appears, it is advisable to check the computer and operating system for viruses. You can do this with “live cd”. We recommend that you use the 4MRescueKit boot disk to enter system recovery mode. In addition to the actual virus scan, livecd 4MRescueKit includes modules for data recovery, file backup and a disk manager like PartitionMagic. Even if this does not help get rid of the black screen of death, you can at least prepare for reinstalling the operating system or diagnose the hard drive in this mode. Live CD fixes problems regardless of version: it can be both Windows and Linux.

    4MRescueKit Boot Kit Helps Eliminate Software Errors on a Disk

    Black screen during the reinstallation of Windows

    Solution to the problem.

    1. Try using a different installation disk or version of Windows.
    2. The reason for the appearance of a black screen and interruption of the download can be either software or hardware. For example, the hard disk contains bad sectors or a usb flash drive or the disk from which Windows is installed is damaged.
    3. Try installing the operating system on a different partition on the hard drive.
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    Viruses corrupted Windows system files

    Many computer viruses can remove or corrupt important system files. As a result, after loading Windows, a black screen appears, although the cursor may be displayed and react to your movements. Not always removing viruses helps to solve the problem, but you can try.

    How to check the hard drive for viruses if Windows does not boot? You need a working computer to which you can attach a hard drive. After booting under Windows, install the free Dr.Web CureIt antivirus. The CureIt utility contains current virus databases.


    Select the hard drive to scan and run the scanner.

    If after detecting viruses a black screen appears anyway during Windows startup, then you need to look for other reasons.

    We write the recovery flash drive and reinstall Windows

    Answer. Install Windows 7 from scratch or immediately install Windows 10, thereby killing two birds with one stone: upgrade and solve the black screen problem when loading Windows 7.

    One of the most cardinal ways to bypass a black screen when loading. Reinstall a stable operating system. Once upon a time, to solve such problems, many of us used the installation CD / DVD disc (see above). After Window 7 came to the desktop PC market, the need for a drive gradually decreased, and today it is the most convenient way to install Windows. This is the creation of a bootable USB flash drive and recovery in boot mode from a usb drive. In general, read the practical guide on how to make a bootable windows 8 flash drive.

    One of the best programs for writing Windows to a USB flash drive. Rufus. The utility is available in Russian, it is free and, as a rule, writes USB flash drives for installing Windows.

    The worst thing that can happen: a hard drive crashes

    Summary. In this guide, I tried to recall and collect from the Internet the most complete list of problems that cause a black screen on the PC. The version of the OS doesn’t really matter, Windows 8, “ten” is it or generally outdated XP. If none of the methods helped, something is unclear or you have your own ways to solve this problem. Please ask questions and add your ideas in the comments.

    Frequently asked Questions

    After entering the bios password, there is no Windows 7 boot icon, the monitor turned off (went into energy-saving mode), the f8 key does not work.

    1. Try to reset the BIOS by removing the battery from the motherboard.
    2. The energy-saving mode will not work immediately after starting the computer, rather the problem is associated with one of the components. Check the connection of the card from the motherboard, the card with the monitor, etc.
    3. If everything is fine with the BIOS, and Windows 7 does not boot, reinstall the OS. Apparently, this is the easiest method to get rid of the black screen.

    After changing to Windows 7 from 32bit to 64bit, a black screen began to appear. When connected to a TV, everything works.

    Perhaps, in the 64-bit version, drivers for the monitor or card are not installed. Check on the manufacturer’s website if the monitor supports this OS. There is a suspicion that specifically your vga-monitor is not supported by this edition of Windows. Try booting Windows in safe mode or with the option “Enabling low-resolution mode (640 × 480)”.

    I use VirtualBox with Linux. Turned off the virtual machine, after loading. A black screen with a bottom underscore on the left.

    If the state is maintained on the virtual machine (Suspend), in principle, no problems should arise. If you turned off the virtual machine, then Linux tries to boot when it is turned on. Why a black screen with an underline appears after rebooting Linux is a separate issue. Check the key settings for the virtual machine. If the error persists, try installing Linux on Vmware Player.

    When I turned on the computer, nothing appeared. The camera works and the computer is turned on. What is the problem. RAM or hard disk?

    To diagnose the problem, it is advisable to recall previous events. Did the computer show any symptoms of a breakdown (hard disk noise), did you delete system files on the disk, etc. This will help narrow down the list of possible causes. Next. Follow at what stage the black screen appears. If the hardware initialization is successful, then it means the operating system. That is, Windows does not start. In this case, we recommend reinstalling the OS from a bootable USB flash drive or disk.

    I changed the card. I start the PC. There is a BIOS, and after that. Just a dark screen. Is it because of the drivers?

    Maybe. Switch to Windows Safe Mode, uninstall the old drivers and install new ones. Then restart your PC. If it does not help, read the full article.

    Answers to readers’ questions

    I have a black screen after loading Windows, I tried everything, but nothing helps: I turn on the computer. Black screen and nothing to do with it. The bottom line is that a black screen appears only after I update the driver on the card. If you put the standard VGA, then everything starts and works fine.

    Before that, I and Windu completely reinstalled and it all started somehow unexpectedly with “nothing”. How to fix a black screen when loading windows?

    Answer. One of the surest ways to resolve OS and driver conflicts on a computer is to go to the website of the manufacturer of your card and download the latest drivers or stable ones, not in beta, to the disk. When downloading, make sure to indicate your operating system in the same bit capacity (32- or 64-bit). It is also possible that your card is outdated and is not supported by modern operating systems, in particular, Windows 10.

    If the laptop is black, try updating the driver

    I have Windows 10 installed. An error occurred while trying to restore the OS from the system image. Now a black screen with a flickering cursor in the upper left corner when turned on. All I can do is turn on the computer and enter Bios.

    Answer. If you see only a black screen and the cursor is a sure sign that the operating system cannot boot (you already understood the problem).

    If the recovery console or the Windows 10 installation disc does not help to restore the OS to its original state or recovery point, create a bootable USB flash drive or a new drive to restore or install the operating system from scratch.

    Not a single folder opened, I decided to start Windows System Restore. A black screen with a cursor appeared on the laptop when turning on / starting the Windows OS. I did everything according to your article, but the screen is still black. Help me please.

    Answer. If, upon starting windows, a black screen appears even after recovery, it makes sense to reinstall the operating system on your laptop in another way. For example, in the boot mode of a USB flash drive or disk. Since, according to your description of the problem, the cursor still appears at boot time, this is a software error, not a hardware error.

    An external box for formatting ext3 by PartitionMagic was connected via usb. After formatting was completed, the laptop restarted and there was no reboot, and a message appeared on the black screen: error loading operating system. The laptop no longer loads, does not respond to any keys. OS XP. How to be, almost everything is on it, there is a 2nd PC with Windows 10. In other words, the laptop is working. But the screen is black.

    Answer. Fortunately, your laptop is dealing with a software failure rather than a hardware failure. All you need to do is reinstall the Windows operating system. After that, the black screen of death will no longer make itself felt. If your laptop has a drive, use a boot disk to restore the OS. Otherwise, a bootable USB flash drive will help you, it’s easy to record it, read the instructions on the link.

    I have a black screen when I turn on the computer. Nothing appears on the monitor when I turn on the computer, and the system unit is working. I did one trick: I pulled out the power, pressed the power button for 5 seconds, released it, inserted the power cord, turned on the PC. Everything worked fine. After 3 days, the same thing, but this trick does not work. I think that it is for the wrong shutdown. I turned off the last time when some of my programs were still running (I have Windows 7) and after loading the desktop does not appear. What to do if the computer has a black screen?

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    Answer. You need to approach the problem comprehensively: to figure out whether the motherboard and the power supply in general are working correctly, whether all the wires are connected to those power connectors, whether the components of the PC are tightly connected to the sockets (for example, very often the “black screen of death” is connected with the wrong connection cards). Perhaps the problem is still not hardware, but software (it’s just not clear from your question whether Windows boots). In this case, reinstalling from the boot disk or restoring in LiveCD mode will help.

    Help understand what is from the PC. I have Windows 7. After the start of the launch, a black screen and cursor appear, after which it is suggested to select Windows 7 and the recommended download or normal. After they are pressed, the download starts and throws it back into the same settings. The same problem with the download in safe mode. It offers nothing further, there is no window to enter explorer.Exe.

    Answer. If, while trying to boot Windows 7, a black screen and the cursor continues to appear, which mode you have not been selected. Most likely, Windows system files have been deleted or changed. A clean reinstallation of the OS or recovery from the Windows 7 boot disk will help. In the boot menu, select “System Restore” and then use the Bootrec.Exe utility. Further actions are described here.

    I have an AMD Radeon graphics card with 512 mb of memory, it did not pull new toys and I found on the Internet how to increase the memory of an integrated card through bios. I changed some settings in the BIOS and installed 1 GB of memory, my pc rebooted and I looked at the characteristics of the card and yes the memory actually increased. Then I started playing games, about an hour passed and my mouse started to hang up, turned on and off myself, and then it stopped working at all, I decided to restart the PC and after that on my monitor I saw just a black picture with some number in the corner. The computer refused to turn on, probably after half an hour clicks on the mouse and keyboard appeared on the screen “Welcome”. The PC turned on, but the mouse did not work, I rebooted again. And again a very long black screen when you boot the computer. What can it be and how can I get rid of it?

    Answer. That’s what overclocking a card leads to. You need to go into the BIOS and reset to factory settings (set by default). Perhaps it is because of the BIOS settings that Windows does not start.

    You are still lucky: with such overclocking of the card, problems with the temperature of the card can occur, up to the failure of one of the components (for example, the processor).

    In general, it is not always possible to trust such overclocking instructions. Even if it contains the correct information, in the absence of proper skills, you can get not only a black screen, but also black smoke from the system unit :).

    I don’t know after what started, maybe after defragmenting the hard drive, after updating Windows, etc. Each time, before loading Windows, a black screen is displayed for 10 minutes and only after that a welcome window appears. The BIOS booted exactly at the beginning, pressed F2 to check the priority of the boot device in the BIOS. Also, during a black screen, the console carriage sometimes appears (bottom slash). What can cause a black screen when loading Windows?

    Answer. In the BIOS, you can not only set the boot priority, but also disable unnecessary devices (for example, a drive). However, this will not save the situation.

    Perhaps the reason lies in the fact that when you boot Windows is trying to find the right library or load a nonexistent component. Go to the startup menu and disable all unnecessary items. You can also disable unused Windows services through msconfig and remove unnecessary applications on your computer. In general, it is desirable to optimize the operation of the operating system and resolve conflicts.

    You can also analyze the steps involved in loading Windows through the built-in tool. “View event logs”. This utility will show how much time it takes to load each process when the OS starts.

    If time permits. Reinstall the OS. On modern computers, reinstallation takes no more than half an hour, and this is a more rational way to solve the black screen problem than a long-term troubleshooting. Sooner or later, any Windows OS has problems.

    I have such a problem. Windows 8.1 is installed, installed a third-party theme, decided to delete, deleted the entire themes folder from windows, although not all files could be deleted, well, ok, I rebooted the computer and after choosing the OS I have a black screen and, no, the cursor appears and disappears bottom toolbar, tell me how to get rid of the black screen? There is no recovery point, no image either, well, no disk with OS either.

    Answer. If possible, search the Internet for a bootable USB Boot image, etc., write to a USB flash drive. Find the Themes folder on the Internet or on the disk and with administrator rights copy it to the previous place from where you deleted the files.

    Without the installation disk, you can hardly get rid of the black screen in a different way.

    Good afternoon! In the evening, the computer crashed. In the morning I turned on the screen. You need to restore the device, error 0x00000e9. I tried to restore through the input and the F8 button, as indicated, there were no changes on the screen. Turned off the computer, already touched all the wires. I turned on the black screen, several times I turn it on and off, the black screen is unchanged. Now I put the Windows disk, the system unit buzzed, I heard that it was starting and still a black screen. What should I do next?

    It was 8.1, everything just flew, the system was completely on ssd, then I had the urge to reinstall win 8.1 on win 10 after the permutation, for a couple of days everything was fine, now when I start the screen is black and the cursor hangs 3-4 minutes after the Windows slowly and with glitches but everything it starts

    At startup, a black screen. The indicators are all on, I tried to just restart, the first time it worked, but then again the black screen. Connected to a TV, everything worked well, what’s the problem?

    My Windows 7 boots normally first. But if you turn off the computer and turn it on again not after 10 minutes, but earlier, then a black screen appears without a cursor. At the same time, the monitor light flashes, which, as I noticed, means that there will always be a black screen. But still after that, Windows 7 boots up. As evidenced by the welcome sound of Windows 7, but the screen still remains black and the cursor is not visible. To turn off, you have to press a button on the system unit. The card drivers have been updated to the latest version from the manufacturer’s website. System recovery does not work. Viruses and malware removed. How can I remove a black screen?

    During the installation of drivers AMD dramatically lost brightness. Rebooted, the boot selection menu is turned on. When turned on normally, the brightness is very low, you can see something only with the help of a flashlight. The brightness is standard, and the screen is dark. OS Windows 7. Please tell me what to do.

    I have Windows 8 installed at work. Well, a couple of small files. It opens the file for a long time. And generally it takes a long time to load. In another office on my computer, 8. Also made a bootable USB flash drive on it. Can I restore my computer with it? When recovering on mine without a flash drive, it says that” some files are missing. Insert recovery disc”.As I am only a user. I’m afraid to completely screw up the system. And it works fine and loads fine, only for a long time.

    Hello, this situation happened. Lenovo tablet stopped working, I press the power button, the screen does not respond, but the backlight is visible. The screen was broken, but a year has passed since that case and everything worked well, and in the last few days the screen just went out, and in parts, but immediately reacted to switching on. What can it be and how can I fix it?