The monitor does not start on the computer

Why the monitor does not turn on when I turn on my computer

Sometimes users of desktop computers and laptops are faced with a situation where the monitor does not start by default when the power button is pressed. There are several reasons for this, they are all different, so to solve the problem with a black screen can be either easy or difficult.

Sometimes users of desktop computers and laptops are faced with a situation where the monitor does not start by default when you press the power button. There are several reasons for this, all of which are different, so it can be either easy or difficult to solve the problem with the black screen.

Causes of malfunction

In fact often the monitor does not turn on even for the simplest of reasons, such as your absent-mindedness or inattention. Well, there is nothing criminal about it. Let’s try to make a repair and start with the simplest steps.

The monitor is off. The thing is that in some computers the “Run” button is not in the usual place. It is located at the bottom of the computer and “looks” into the floor.

You may have accidentally bumped it and the equipment successfully shut down. Try pushing that little button. Nothing happened? Well let’s proceed to monitor repair.

Monitor power supply malfunction

If power supply unit for some reason is not able to supply enough power to the monitor, then the screen may well blink at startup. It’s not recommended to disassemble the component yourself: it’s better to take monitor to service center. But you can independently measure voltages to compare technical specifications which are usually located on the PSU case. You will need a special tool for this. a multimeter.

External power supply of the monitor can be replaced only by the device with the same parameters.

Why does the monitor not work?

    Lack of power supply of the monitorIn the first place check the monitor’s power supply. When monitor is plugged in. You should see a yellow or red light on it. Check the plug of the cable connection to the socket and power cable connection to the monitor itself. Also you can try to connect the monitor with another power cord. If everything is connected and the power light is on, then the problem is not in the power.

Along with this we also recommend checking the correctness of the connection in the connector itself, to do this, remove and re-insert the connection cable, both in the system unit and in the monitor itself. There is a chance that the connection cable is broken, so try to connect the monitor to the computer with another cable.

If you have 2 video cards then make sure that in your BIOS setup the integrated video card is disabled.

If you don’t solve the problem or if you haven’t performed any operations in the system unit before, try to plug the card into another slot on the motherboard, and if you have an integrated card. connect the monitor to it, after pulling out the discrete card to check the monitor itself. It is possible that the video card itself is broken.

It may be that the monitor itself is broken, this is also encountered. Do not get too upset, because if the monitor does not turn on, it is not as bad as in the case of problems with the screen matrix.

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When the monitor displays the BIOS boot screen but after that a black screen and no sound start the OS, reinstall the system.

If the monitor doesn’t work after all the above steps try connecting it to your notebook or video player to check if it works. If the monitor works when connected to a video player and doesn’t turn on when using the computer. There is a problem with the video card or other computer components. If the monitor doesn’t work when connected to another device. take it to the repair shop. You can also try to connect another monitor to your computer or a modern TV set; if the picture will be there the problem is in your monitor, if not. look for the problem in your computer accessories.

We wish you success in solving the problem. If you fail to solve it, our experts will help you.

Video card problems

Conventionally, this problem can be divided into two parts at once, concerning discrete graphics cards and integrated. In this case, the approach to diagnosing and resolving the problem, as a rule, is always the same.

After using the video card built into the motherboard, you should as a test switch to a discrete memory. If this is not possible, you need to find a suitable replacement for your motherboard, referring to the appropriate manual.

In the case of a laptop, if the built-in memory fails, you can not independently switch to a discrete graphics card.

If you have difficulty connecting a monitor to a discrete graphics processor, you should disassemble the system unit and carefully inspect the video card connector. Examination and cleaning of the connection pins of the card, as well as its correct installation can help to solve the problems with the screen.

At this point we can finish this section of the article, because if the problem persists, the only solution is to completely replace the video card.

Do not try to repair the defective device yourself, otherwise you may provoke failure of other PC components.

Cable is loose from hard drive

Carefully examine flat cable from HDD to motherboard chipset. The ends of the flat cable should be tightly locked in the slots without any hesitation. If you have several slots (and on modern motherboards they are few) it is worth to move the cable to other slots, both motherboard and hard disk (this often helps).

Also, the problem may be in the cable itself. Insert another one (it is not expensive) and check if the computer boots normally or not?

Monitor is turned off

Sometimes the screen doesn’t show an image simply because the user has accidentally turned off the monitor itself. The stated cause looks paradoxical, but it is very common. The power button on many devices is not located on the front panel, but on the end panel below. After the first start of the computer the users don’t turn off the monitor itself. and it works in standby mode. After a few years of such use you can in principle forget about the existence of a power button. As a result one accidental press on it turns off the monitor, and the owner of the device can not even imagine the real cause of the problem. You just have to press the power button a few times before you can analyze the problem. If the image does not appear on the screen, you should look into the defect more deeply.

Another common reason for which the monitor may not work when the computer is on and working, is the banal lack of power. The cord is plugged in very tightly, but when the screen shifts, the contact is sometimes lost. That’s why it’s necessary to check the quality of connection of the monitor to the mains.


When the computer itself does not work and the monitor does not work for some reason one of the suspects may be the memory module. Usually the RAM may make some noise when powered on. Although this is not a prerequisite.

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You must check the RAM and make sure that the problem is not on its side.

For this purpose you need to switch off your PC, disconnect its power and remove the side monitor cover. Remember or even take pictures of exactly how the memory was installed in the system unit. Now pull the side latches to the sides and remove the RAM modules.

Using an eraser or sponge soaked in alcohol, wipe the contacts of the modules. Then put everything back, connect the cable and check if the monitor will work after these manipulations.

If this does not change the situation try one more variant. If you have more than one module, leave one and remove the others. Or you can swap the slots. After each of these manipulations try to power on the computer.

monitor, does, start, computer

If the screen eventually displays an image, then the cause is in the RAM. The problematic module will have to be replaced.

As you see, the system unit, or rather its components, may also be the reason that the PC itself works, but the monitor does not turn on.

How to fix the problem and fix the screen

The bad news is that some problems cannot be solved by yourself, so you may need the help of a specialist. But before that, you need to know exactly what the problem is. If you have a second monitor and a system unit, you need to do the following steps:

  • Connect another monitor to your PC. if that doesn’t work either, chances are that the problem is on the PC side or the cable side much more;
  • Connect your monitor to another PC. if in this case the monitor also does not work, then with a high probability the problem is in it and not in the PC.

There is usually only one computer in one family. But you can get out of this situation nicely. if you live in an apartment building, you can ask your neighbors to help you in this matter. In this case, make sure that their system unit and monitor have the same connectors as your devices, otherwise such text is difficult to consider relevant.

Problems with the power supply

A power supply is a component installed inside your system unit. This component looks like this:

It is important for you to know that the current that goes into your PC is distributed by the power supply to all the components of your device. Each device has its own consumption, and if the total power supply capacity is not enough to power all the components, problems arise.

You can calculate on your own how big the power supply in your PC needs to be to properly power all the components. But keep in mind that cheap models, often do not match the declared power. For example, a 500W PSU in a low-end category could give you 340-370W. So. you should have a margin.

If you have recently connected new components, and after that you have problems with the screen. then return everything to its original state, and then test. If you really need more power then the only way to solve this problem is to buy a new, more powerful PSU.

If the power supply does not run the whole PC and not only the computer then the problem is in the power supply itself. You do not need to be a pro to figure this out. Do a simple test. pay attention to the indication of the unit, and the cooler. if it starts. If this test passed, then look at the motherboard. There are special indicators on it that show with LEDs that the power is coming in:

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If one or more lights are not lit. this is a clear signal of problems with this component. Light bulbs are connected to components such as CPU, GPU, etc.д sometimes the problem is not in the PSU, but in the components themselves, but here without special equipment or using an old PSU on a new, 100% working PC, you can not.

RAM Problems

It is no accident that we put the problems with RAM above the problems with video cards. because according to our own statistics, problems with RAM are more common than with “video.

You need to conduct a visual inspection of the RAM. To do this, carefully unscrew the lid of the system unit and examine the component. It must be firmly seated in the motherboard. If not, remove and reinsert the component.

Also check if the pins are okay. They tend to get clogged with time. These can be cleaned with a simple eraser:

If you have several memory cards, then test the system by taking out one of them in turn. Sometimes if one card is broken and the other works. then you have a problem with the monitor, it does not turn on when you start the computer. If you find this. then the only solution to the problem, replace the RAM, as a rule, such components are not amenable to repair and only replace them for new.

Video card problems

When the monitor doesn’t turn on when you turn your computer on it seems impossible to find the cause and fix the problem. but that’s not true.

Most modern computers have two video cards at once, one built-in and one external. As a rule, everyone uses an external one, as it is faster and more powerful. To test what went wrong, switch your monitor from an external card to a built-in card. You can literally check for the presence of a built-in card by simply inspecting your PC from the side of the connectors:

If it works with the built-in card, consider that you have found the source of the problem. If there is no built-in card, but you need to find out the problem, then conduct a basic test. run the system and pay attention if your PC has a working cooler at the video card. Often, when it fails, it is the connector that breaks.

Also check all resistors and capacitors in the card. they must not be broken or swollen. This is a rudimentary test that will allow you to identify most problems without a specialist.

Also, as with RAM, don’t forget to check the pins. that the card is installed correctly and that the pins are clean. If necessary, clean the connector and reinstall the card. Despite the fact that “just yesterday” card was working fine, it can accidentally “snap” and this will be the reason why the working card does not work.

Chipset problems

This problem can only be diagnosed in a service center. It has to do with your CPU chipset.

We have only encountered this problem once in over 10,000 devices that we have worked with. Therefore, the chance that it is the processor that has failed is so minimal that you can dismiss it as a margin of error that can be neglected.

As a rule, only very old processors break, but they also work for decades.

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