A laptop user may encounter the following problem: the screen goes blank under various circumstances. Why by itself when the power is turned on, and after a certain period of operation? There are four common reasons that cause this phenomenon. It is important to note that when this phenomenon occurs, the screen does not always stop displaying information. If you shine a flashlight on it, you can see the picture. However, it remains so dark that the screen appears to be turned off.
Laptop screen problems can occur for several reasons.Power problems
One of the reasons why a computer turns off by itself is incorrect power settings. To configure, follow the following algorithm:
- open the control panel;
- Click on the “Hardware and Sound” tab;
- open "Power Options".
This section identifies possible power management schemes, including the current one. By default, this is the "Balanced" scheme. Enter it and look in the settings for the time that is set to the “dim display” function.
PC power settingsThis setting improves energy efficiency by dimming the screen after a specified period of time when no keys are pressed or the PC mouse is not moved. If goes off, select a different power mode that does not offer screen dimming when the device is idle.
Try the combination function keys to turn on the screen. Each laptop manufacturer has its own, you will find it in the instructions. Look for a combination that turns the screen off and on. If the work field becomes dark, press this combination once or twice. In some cases this technique helps.
Dust in the computer
In some cases, the laptop turns on, but the screen is black due to problems caused by dust. Dust gets clogged between the connections of the elements and disrupts the contact between them. If the processor does not heat up above standard values, then you can clean the computer yourself.
To do this you need:
- De-energize the laptop by turning off the power and removing the battery.
- Unscrew all bolts on the rear panel.
- Remove the back wall, working carefully. It should open without effort.
- Use cotton swabs to remove any noticeable accumulations of dust from visible parts.
- Replace the device cover and return the battery.
Dust interferes with the quality cooling of the laptop
If your laptop screen is still flickering, you can entrust better cleaning to professionals. At independent work It is important to remember that the bolts on the cover may also be under the rubber “feet”, and the cover itself may not open, but move to the side.
Reinstalling drivers
If , and turns off immediately, the first thing you need to do is check your video card drivers. Software errors lead to different types problems: the screen may flicker, darken and even turn off the image completely. In some situations, colors become extremely dull. Diagnosis and reinstallation of drivers is simple and important step to fix the problem.
Reinstalling drivers can help with many laptop problemsTo find suitable software, you should visit the official website of your PC manufacturer. Running software downloaded from various free resources can cause great harm to the operating system. After downloading, installation is carried out according to the recommendations that the installer will sequentially issue.
BIOS problems
If dark screen on the laptop occurred after installing BIOS updates, then the system needs to be rolled back to the previous version. That is why before updating you need to do backup copy all data. Manufacturers of this type of PC regularly create system updates that need to be monitored.
Before updating the BIOS, you should make a backup copy of itIf you did not update, then the problem that the computer starts and immediately turns off may be due to its absence. Errors may be caused by the fact that you installed new hardware or old version problems appeared. It is important to remember that if you update the BIOS yourself, you risk damaging the motherboard and voiding your service warranty.
When updating, remember that you need reliable information about the version of this program you have, as well as accurate model information motherboard. The information in PC documents is not always accurate, and there are special programs to check the type of equipment.
Can viruses cause the problem?
Despite the fact that the varieties virus programs you can't count it, the probability that the monitor turns off and the computer continues to work is very small. This is more likely an indication of a hardware problem or software failure. And yet, indirectly, damage to the settings can cause this phenomenon.
Therefore, you need to check for viruses step by step in three modes:
- Standard.
- When turned on.
- In a safe place.
If there is no result, then you will probably find a certain amount malware and make your PC more stable. However, viruses are characterized by the following phenomenon: the computer turns on and off immediately. To resolve this glitch, you will need to log into the OS in safe mode and run a scan with a reliable, high-quality antivirus.
What to do if none of the checks helped?
If the monitor screen goes blank, the computer continues to work or turns off, and none of the above methods helped, you need to evaluate the quality Windows operation. Sometimes serious OS problems lead to the most unexpected problems. To turn on the laptop if the screen is black, you should find installation disk or a flash drive and connect it to the device.
Work from the selected media. Although this will limit your options, you will be able to see that the problem goes away. Then you need to reinstall operating system. If with removable media The computer turns off immediately after turning it on, then the problem is not in the software.
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Make a schedule for turning off and turning on. If the monitor turns off, but the system unit is working, it is important to find a pattern in the time the screen turns off. Even if this does not give you an idea about the cause of the problem, the information will be useful to the service staff.
The situation when the laptop screen goes blank is quite common. It is most often encountered by novice users who have recently purchased a device.
Note! It is quite possible that this is due to some technical errors. Statistics show that this applies to only 10% of cases, the remaining 90% occur in incorrect setting or software problems.
It is worth considering the most basic reasons why this problem. Moreover, once you become familiar with them, you can easily correct them.
The most common cause is a lack of power settings. It’s very easy to deal with this, just follow a simple algorithm:
If the user has a laptop from the manufacturer Acer, then he just needs to press the “Fn” and “F6” keys simultaneously. With this simple action the problem may be resolved. On laptops from other companies, you need to press other keys, which are indicated in technical instructions to the device.
Dirty laptop
The second most popular reason is congestion. The most common situation encountered is Asus owners. It was noted that immediately after cleaning the device stopped going off.
You can take your laptop to professionals for cleaning, but it’s quite possible to do it yourself:
- First you need to completely turn off the device, it should not be in sleep mode. It also needs to be disconnected from the network. The user will then need to carefully flip it over so the lid is facing down and disconnect the battery.
- The next step is to remove the cover of the device. In some cases, it can be removed not completely, but only partially. You will need the part where the cooler is located, which is needed to ensure that the laptop does not overheat. The bolts for each model are different, it all depends on the manufacturer. They need to be carefully unscrewed. Most often, manufacturers hide the mount itself behind special stickers or rubber inserts. Usually the cooling system is immediately visible, as it accumulates the largest amount of dust.
- When disassembled, the device will look like this:
- Since the user only needs the cooler for cleaning, it must be carefully removed. It is important to remember that you must first disconnect the power cable.
- Now you need to arm yourself with a brush and a vacuum cleaner. They need to thoroughly blow out the entire case, paying special attention to the corners and the radiator. It is a yellow or orange plate in which there are many different slits. You also need to thoroughly blow out the cooler itself. At the end of cleaning, simply brush away any remaining dust with a brush.
This completes the cleaning process. It is necessary to attach everything back, namely the cooler (after first reconnecting it to the power cable) and the cover. All bolts must be reinserted, the existing stickers must be pasted over them, and rubber inserts must be attached.
Incorrect driver operation
It also often happens that one of them does not work quite correctly. For example, if the video card driver does not work correctly, the screen may often go dark or work with some glitches. Simply installing them again is enough to solve the problem of dim color and causeless fading.
It is necessary to download them only from official sources, otherwise you can only harm your computer.
If the user does not know which drivers he has on his laptop and which he doesn’t, then he can use the program “ DriverPack Solution" It will not only help you find existing drivers, but will also update them to the latest current version. It also needs to be downloaded from the official website.
Experts recommend not working on your laptop at this time, closing all other files and applications, and letting the program update the selected devices. On average, this procedure takes no more than 20 minutes, depending on how long ago the drivers on the PC were updated.
Note! This program is useful not only if the laptop screen goes blank. Updating drivers can improve performance and speed up the system.
The reason is in the BIOS
If the methods described above did not help, then it is likely that the reason lies in. You need to go to the official website and see the list of updates. If so, the BIOS will need to be updated.
Viruses
Malicious applications often lead to various problems with a computer. However, statistics show that in this case the reason lies in them quite rarely.
If the methods described above do not help, you will need to resort to this method and verify the presence or absence of viruses. To do this, you need to run a scan with any antivirus. If it is not there, you will need to download it. Let's look at virus cleaning using the example of the popular Avast antivirus. There are both paid and free version. In this case, we will consider one for which you do not need to pay, but the user can install a paid option.
After getting rid of malicious applications The laptop screen should stop going blank.
If all else fails, you will have to take your device to service center, where specialists will detect and fix the problem.
Video - Backlight turns off or laptop screen goes dark
If your laptop screen does not turn on, then the first thing you should try is to reset the hardware settings. If this does not help, then you will have to look for other causes of the problem, which may be so serious that you cannot do without a trip to the service center.
Reset settings
A hard reset helps in most situations where the screen does not work. To execute it:
- Disconnect the charger from the laptop.
- Remove the battery from the laptop.
- Remove any residual charge and reset the hardware by holding down the power button for 20-25 seconds.
- Place the battery back into the laptop and connect the charger.
If a window appears asking you to select a boot mode after an incorrect shutdown of the device, select the normal Windows startup.
Checking the laptop display
If after resetting the hardware settings there is still no image on the screen, then try to determine which component has failed: the video card, matrix or other part of the display. An external monitor will help you do this. For example, on the ASUS website in the support section it is recommended to do the following:
- Connect an external monitor to your laptop using the existing interface - HDMI or VGA.
- Turn on your laptop. Using the combination Fn+F8, select broadcasting the image through the connected monitor.
If on external screen If the image does not appear, then the problem lies in the operation of the video card. This is also true for laptops from Lenovo, Acer and other manufacturers. If the picture is displayed on the monitor, then you should further look for a problem in the laptop display. The check should be carried out if the laptop's fan is noisy, the indicator lights up, or there are other signs that the laptop is turning on. If there is nothing like that, then perhaps the problem is not in the display - the entire laptop is not working.
Resetting BIOS Settings
If the problem occurs after changing the BIOS settings, you can try rolling them back to the factory state. Using a keyboard to do this will be problematic, but possible. The BIOS has hotkeys that are responsible for performing certain functions. A factory reset is usually done using the F9 key.
In theory, you can enter the BIOS by pressing the Delete key, then reset the settings (F9) and save the configuration (F10). But in practice, there is a high probability of missing the right moment, so it would be wiser to reset the settings by removing the CMOS battery, which stores the BIOS settings. 
The main disadvantage of this method is the need to disassemble the laptop. But you will be sure that BIOS settings reset, and if the cause of the black screen was incorrectly set parameters, the problem will be resolved.
Reinstalling the RAM stick
If the problem occurs after cleaning the laptop, then you should disassemble the laptop again and make sure that you installed all the modules correctly and connected the necessary cables. Therefore, for proper disassembly/assembly of a laptop, it is recommended to use the manufacturer’s manual - then the likelihood of an error occurring is significantly reduced.
In some cases, reinstalling the RAM strip can help solve the problem of no image on the laptop screen. This is especially true if liquid has been spilled on the laptop keyboard, or long time was in a damp room, after which malfunctions occurred.
After reassembling the laptop, try turning it on again. If the black screen remains, although the laptop turns on and continues to work without an image on the display, then contact a service center. Possible causes of the problem:
- Damage to the display cable.
- Keyboard short circuit.
- Inverter failure.
- Backlight lamp failure.
These faults are unlikely to be resolved on your own; qualified assistance using special tools is required. The worst thing that can happen to a laptop is the motherboard failure. But then he will not show any signs of life. In any case, diagnostics at a service center will reveal the exact cause.
Problems resuming from sleep mode
If the screen remains black when resuming from sleep mode, the first thing you should do is check your video card drivers. Software there must be latest version and fit the system. You can download the latest drivers on the laptop manufacturer's website. 
In some cases, the problem is caused by improper sleep mode support. Windows devices input. Exiting sleep is done using the touchpad (mouse) or keyboard. If connected external device, then it can block the laptop from waking up. To fix this flaw:
Save the configuration by clicking "OK". Do not prevent the mouse and keyboard from waking up the laptop at the same time, otherwise you will not be able to wake the computer from sleep. Set the ban on both devices in turn, checking if there is a positive effect.
Laptop overheating
If the screen on your laptop goes blank during operation, then most likely you are faced with overheating of the equipment. First of all, you should check the temperature of the video card. Use for this free utility Speccy. 
If you see that the video card’s temperature is too high (you can see the maximum permissible value in the specifications on the manufacturer’s website), then you should check the laptop’s cooling system. Sometimes just cleaning the cooling system is enough, but if the installed coolers are not powerful enough, then try using a cooling pad or installing more powerful fans.
Connecting the system unit to the monitor is quite simple; to do this, you need to connect them with a cable through the appropriate port, after which the image will be broadcast on the screen. Despite the relative simplicity of the procedure, a number of problems may arise immediately, even after a successful connection. If the monitor goes off while the computer is running, many users may complain that this is due to its malfunction. In fact, this is not always the case, and below we will look at the main reasons why the monitor turns off during operation system unit.
Signal loss due to faulty cable or connector
The most common reason why the monitor turns off for a while while the computer is running is a faulty cable. In this case, you need to check the condition of the cable itself, which transmits information from the computer to the monitor. Most often, a DVI or HDMI connector in the computer case is used to output images. Make sure the cable is inserted firmly if we're talking about about DVI, it must be tightened, otherwise the connection will not be reliable.
If damage or a poor cable connection cannot be identified, it is recommended to try using another port for connection in the system unit; most often there are several such ports. Also try to get a cable that is definitely not a problem, and connect the monitor to the system unit through it.
The monitor turns off due to problems with the video card
In a computer, the video card is responsible for displaying images on the monitor. Its malfunction can cause the monitor screen to go dark while the system unit is running. You can make sure that the problem is not related to the video card by connecting the computer to another monitor or, for example, to a TV. If the image is displayed on it without problems, then the option with a faulty video card can be dismissed.
Most often, a video card malfunction, which can lead to temporary interruptions in the output signal, is associated with overheating. The base cooler of a video card is not always enough to cool the chip on it, especially if the video accelerator is . Check the video card temperature using special applications, making sure she doesn't go beyond .
It is worth noting: If the problem with the monitor turning off when the system unit is running is due to overheating of the video card, it may appear, for example, only when running resource-intensive games or programs.
Monitor turns off due to bad memory modules
Another common problem that can cause a monitor to temporarily turn off is the failure of the RAM or its operation with errors. To make sure that this problem does not exist or does not exist, it is recommended using Windows or third party applications. Even if one of several RAM modules is faulty, this can cause the monitor to spontaneously turn off while the system unit is operating.
RAM modules cannot be repaired, and if the test reveals problems in the operation of one or more of them, you will need to purchase new RAM sticks in their place.
Monitor malfunction
If the monitor goes out while the system unit is running, it cannot be ruled out that there are some problems with it. Most monitors have protection that automatically turns off the screen if there is a risk of overheating. It is not possible to check the temperature of the monitor using diagnostic tools, so the only option is to “touch” to determine whether it is too hot. If your monitor is overheating, you may need to place it in a more ventilated place in the room or, for example, move it further away from the wall.
The monitor can also turn off automatically if it is working in a room with high humidity. In such a situation, you need to move the monitor to a room with normal humidity and let it stand for some time without connecting to the network. During this time, the settled moisture should evaporate, and when working in a normal environment, the monitor will no longer go out if corrosion has not yet formed.
In this article we will look at possible solutions problems when the laptop works but the screen does not turn on. This can happen to each user for different reasons.
We recommend reading our article sequentially, i.e. first solution, second solution, etc., as we have ranked them in order of popularity. It is the first solution that most often helps most laptop users.
So, let's see what to do if the laptop works, but the screen does not turn on.
Solution 1
First, you should unplug the power cable if it is still connected. Next, turn the laptop over and remove the battery from the back panel. Turn the laptop back to its normal position. Make sure the power cord is unplugged.
Now hold down the Power button, hold it for 30 seconds and then release it. Next, connect the power cable, but do not insert the battery. Press the power button to turn on the laptop.
Check if the problem has been resolved. If the laptop is working, but the screen still does not turn on, repeat the steps again, but now hold the button for 1-2 minutes.
Solution 2
Connect your laptop to an external monitor or TV via HDMI or VGA port. Then you need to press F8 to sync your laptop with your external monitor. If nothing happens, try the F3, F10, or other keys, depending on the manufacturer of your laptop.
As a result, you should see the laptop screen on external monitor. If this happens, then the problem is still in the screen, most likely in the backlight inverter. In this case, you should contact a service center to have it repaired.
Solution 3
The last solution also requires hardware intervention, namely to check RAM.
Turn the laptop over and find the module into which the RAM is inserted. Remove the RAM but do not touch the metal part. Insert the RAM into another slot. Turn on your laptop and check it's working. If no change, try moving the RAM to another slot and check the operation again.
Perhaps this is all you can do yourself to fix the problem when the laptop works but the screen does not turn on. Otherwise, you should contact the service center for the help of a technician.
