For a significant number of people, life is simply impossible without a computer. Therefore, it is very unpleasant when there is a problem with your favorite device. For example, some users are faced with the fact that the computer does not see the monitor. This can happen both with a standard device and when connecting an additional device.
There are a great many reasons for this trouble. Sometimes users simply forget to connect a monitor. However, most often the problem is more global. As a rule, when the computer does not see the monitor and there is no signal, the reason may lie in the hardware of the device. For example, a damaged cable, insufficient RAM, an error in the video card, or even the motherboard itself. Slightly less often, problems are associated with the operation of the system itself. Let's try to figure out why the computer does not see the monitor and how to solve this problem.
Power check
First of all, it’s worth starting with the simplest. No matter how absurd it may look, but sometimes everything is too obvious, and it does not occur to anyone. Therefore, if the computer does not see the monitor, then you need to check whether the cable has come off and the power button of the device is pressed. This should be indicated by a special indicator light.
If the monitor is working properly (at least it is connected accurately) and there is no image on it, then you should try to press the menu button, which opens the screen settings control panel.
Checking the computer
If the breakdown is due to the incorrect operation of the PC, then it is quite easy to check. If the computer does not see the monitor through the VGA cable, then just try to connect the screen to another device. Today, almost all modern TVs are equipped with the same connector. However, if it is impossible to verify the operation of the monitor in this way, then it is worth paying attention to some nuances.
If the computer is malfunctioning, the lights may begin to flash on it . If you encounter any problems, the power button or any other PC indicator starts flashing red. In addition, the computer can emit characteristic sound signals. All these signs indicate that the problem is not with the monitor, but with the PC itself.
If the computer does not see the monitor and at the same time “beeps”, then this indicates possible problems with the video card or motherboard. In this case, you should contact the service center or try to find out on your own in which particular node the failures occur.
Sometimes the monitor is connected normally, and the PC turns on without problems in normal mode, but there is no image on the screen. Perhaps the device is just in sleep mode. In this case, you can try to click on any buttons on the keyboard or move the mouse. If the computer does not see the monitor, then do not despair, there are still plenty of options for fixing the problem.
Cable check
If the wires are damaged, this can also affect the operation of the device. In this case, it does not matter, the computer does not see the monitor via HDMI, DVI or VGA. Any of these wires can move away at the most unexpected moment. Most often this happens when the cable is not screwed into the back of the screen and PC, but simply inserted.
If you are using a dedicated video card, you need to make sure that the screen is connected to it, and not to the regular connector on the motherboard. As a rule, the system automatically disables the regular schedule and uses the connected device. If this does not happen, then you need to turn off the image feed through the "mom" manually.
Motherboard problems
Many people use two monitors on their PCs at once. If the computer does not see the second monitor, then the problem may be that one of them works from the motherboard, and the second from the video card.
In this case, using a different type of cable or setting up an additional screen with another method will help. Most likely, the picture will be worse in this case.
Resolution
Quite often, such problems occur when the picture quality does not match the capabilities of the monitor. In this case, the screen will not work or will turn off with an enviable frequency. To solve this problem, just restart the system and start it in safe mode. After that, just change the resolution to a lower one.
However, everything is not so simple. The fact is that modern operating systems return their original resolution after 15 seconds. Therefore, you need to click on the "Save" button in time. In addition, the system may begin to aggressively switch resolution when it detects more suitable, in its opinion, parameters.
Another situation may also occur. For example, when the monitor does not show "signs of life" when the computer is running. In this case, it is possible that the user simply connected two monitors and then turned off one of them, but the operating system for some reason did not receive this signal. In this case, it is recommended to hold down the Fn button on the keyboard (usually it is to the left of the space) and press F1, F12 or another key (depending on the model of the laptop).
Go to BIOS
Sometimes users are faced with literally mystical device behavior. For example, when you turn on the PC, the monitor displays information about the start of the system boot, but after that the image disappears and nothing else happens. In this case, the problem may be deeper, perhaps the whole thing is in Windows. What if the computer does not see the monitor in this case?
To do this, boot the system in safe mode and restore the OS using the built-in system restore function. You can also manually reset the factory settings. However, for this you need to have sufficient knowledge and skills.
Checking equipment
To fix the problem, you can try disconnecting the keyboard, mouse, external hard drives, printer, scanner, speakers and all other devices from the computer. Sometimes, due to problems with third-party equipment, problems can occur in the most unexpected nodes.
After that, you need to turn on only the monitor and the computer and wait for the download. If this does not help, then you need to inspect all the connectors on the devices. Very often, users pull out the cables with too much movement, which is why the ports stop functioning normally.
If they are damaged, then you can try to solve the problem yourself or take the device to a service center. As a rule, ports bend in the connectors, this can be seen with the naked eye. Therefore, you can try to align them with your own hands.
CPU
Sometimes all nodes of the system are working properly, and there are no problems in the monitor itself. This situation puts in a stupor any user. This is not surprising if the PC makes a distinctive sound, and the monitor works great with other devices. In this case, the problem may be with the processor. If it fails, the computer will make a characteristic sound, but in fact the system will not start loading. This is because coolers spin, but nothing else happens. In this case, even the motherboard can produce a number of characteristic sounds. However, nothing can work with a burned-out processor.
Video card
This board may also fail, thereby provoking the problem described in the article. In this case, the PC will also produce characteristic sounds, but it will not be possible to display the image.
To check the video card, you just need to connect it to any working system unit and try to start it. If the computer does not work with another monitor, then the whole point is in this board.
Some malfunctions can be detected using the computer’s self-diagnostic tools. To do this, you also need to insert the video card into the system unit and run BIOS testing. If during the verification process the PC starts to produce uncharacteristic and very sharp sounds, then the problem is in the board.
However, before checking the video card on another device, you need to clarify whether it is suitable for it. For this, it is necessary to clarify not only the system requirements, but also whether the connectors on the board correspond to the ports on the "mother". To do this, you should consult with specialists or ask for advice in a specialized forum.
If all else fails, it remains only to contact the service center and conduct a full diagnosis. It will cost a lot.
It is also not recommended to try to repair the computer yourself if the user does not have the appropriate skills and knowledge. In this case, the machine can be damaged even further. Ultimately, repairs will cost even more.