Monitor Does Not Turn On When Starting Computer

Today we will analyze a situation where you turned on your computer, the processor worked, and the monitor remained black. This, of course, is not nice. Some people have a feeling of panic that everything, the computer “flew”, needs repair or, in general, have to buy a new one.

Who has not yet encountered a similar problem, do not rush to despair. Not everything is lost. Of course, there is clearly no way to do without repairs or acquisitions, but the scale is not as serious as it might seem at first glance.

There may be several reasons for this problem. But, conditionally, they can be divided into two categories: either the problem is in the monitor, or in the processor itself (but here anything can be).

Read also:

The computer does not turn on. What to do? (Solving problems with starting (loading) a computer, monitor and noisy fan)

How to clean your computer from debris and speed up its work? (make your computer or laptop work fast and clear)

And now, let’s look at the common causes of problems with the monitor.

Monitor Does Not Turn On When Starting Computer

How to check the monitor for performance?

So, let’s start with the monitor. Check its performance is very simple. Disconnect from the system unit and connect to a conventional power supply. Turn on the monitor. The power light is on, “No connection or check cable.” is displayed on the screen.

If you did not see this, try pressing the menu button. If again no results, then the monitor can only be thrown out and go for a new one. But if you saw all these inscriptions, then you are lucky with the monitor. But no luck with anything else. But with what, we will look further.

The first thing to do is the standard procedure for any failure. Resetting the BIOS. Most often, after this procedure, many problems are solved. In order to perform this operation, turn off the computer completely, even from the network. Next, open the processor and on the motherboard we find a tidy battery.

We take it out for a couple of minutes, then insert it back and turn on the computer.

If nothing happened after that, we will inspect and check the entire unit. First of all, we check all the contacts. Especially RAM. It often happens that it is because of it that the computer may not turn on. We take out the memory modules. Inspect their contacts, if necessary, then clean. You can clean them gently with an eraser. Insert back. Check the contacts of the cable that connects the monitor to the processor.

We clean the entire processor from dust. Slots where memory is inserted, fans. They are, in general, very clogged with dust. Check the connection of the card. We also take out and clean.

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Remove the power supply. It is clogged with very dust. Therefore, it must be opened and thoroughly cleaned.

So, we checked everything, cleaned it. But nothing works. The processor fan seems to be buzzing. It turns on. But the monitor screen is still black.

The card is the likely reason the monitor doesn’t show the image.

There is one more option and, most likely, it will be true. The card burned out. True, the probability of this breakdown is not so high. Maybe, of course, the card and the whole. But in this case, the matter is already somewhat more serious. You need to change the motherboard itself.

How to check a card? Remove it from the slot, check the contacts and reinsert it.

If you have at your fingertips a second computer that supports the tested card, insert it there and turn it on. If the computer boots up normally, then the problem is not in it. If nothing happened, change the card. This option is acceptable only if you have at hand where to check the card.

If not, then you need a master. In general, if you have a gaming computer, and you are very “straining” the card, it is recommended that you periodically diagnose it so that it does not fly at the most inopportune moment. There are a number of programs for diagnostics, among which one of the most popular is FurMark

Power supply check

Well, the last thing to be checked is the power supply.

For this, we will also need a working power supply. Open the computer, disconnect all the connectors of the tested power supply from the motherboard, and instead connect the working one. After that, turn on the comp. If everything worked, then the reason is in the power supply. If nothing happened, then the problem is in the motherboard and you will need to change it.

Here, in general terms, the scheme for checking the health of both the computer itself and its individual elements.

In case, when you turn on the computer, your monitor does not turn on, but the indicator flashes. Advice, if you turned on the computer, but it either didn’t turn on or the monitor didn’t light up, turn it on again and carefully listen to how it buzzes and how many times it beeps.

By the number of squeaks, you can determine the error code. Descriptions of these codes are everywhere quite a lot, and finding them will not be difficult.

  • First thing to check
  • Checking the display settings menu
  • Cleaning the system unit from dust
  • Solving a problem with drivers
  • Reset BIOS configurations
  • Motherboard problems

Why does the monitor not turn on when the computer is turned on?

  • The monitor cable is plugging into the wrong connector;
  • Faulty power supply, adapter, connecting cable, specific port or damaged contacts;
  • Lack of power to the monitor due to damage to the plug or outlet;
  • There are problems with the RAM or processor;
  • Physical damage to the hardware of your system unit, for example, a problem in the card (discrete or built-in);
  • The monitor does not work or shows a black screen due to automatically set BIOS parameters;
  • The presence of a serious software failure in the operating system after updating the drivers of the adapter, etc.
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Key Causes and Problem Solving

Before undertaking any serious manipulations, you should make sure whether the matter is really in the monitor itself.

Quite often, in the absence of image output, appears on the screen the inscription “No Signal” (No Signal), which means that you do not have a monitor connected to the system unit, but the monitor itself is working.

Check connecting cable VGA, DVI or HDMI. Perhaps one of the ends is not tightly attached or not connected to the corresponding jack at all. Perhaps after reconnecting the monitor will work.

Remember to rule out nutrition problems and make sure that mains filter plugged in. When voltage is supplied from the outlet directly or through an extension cord, a light or power indicator lights up at the bottom of the screen.

On some monitors and system units there is backup power key. Often located at the back or side of the chassis. It does not hurt to make sure that it is switched to the active On mode.

One of the most common causes of equipment inoperability is bad contacts. You will need a trivial check of the places where the wires are connected to the motherboard / discrete graphics card and the back of the display. Also carefully inspect the wires for integrity.

Do not rule out cable contact oxidation. To fix the defect, unplug the cord and wipe both ends of it with alcohol.

By the way, situations with wrong type of transmitted signal. Most adapters provide two ports for cable connection between a monitor and a computer. White is DVI, blue is VGA. If your type of connection is DVI, you can try changing it to blue, then vice versa.

If all else fails, try connect another monitor to the computer and see, will the picture appear. If your TV and PC have an HDMI port, it’s easy to use TV to check. You can also always connect the monitor to another computer or laptop if you have the correct connector. It may be that on the old LCD screen the matrix backlighting lamps, built-in LEDs, cables are damaged or it simply burned out. In such cases, you will need to contact the service to replace the faulty component or purchase a new monitor.

Incorrect monitor settings

If the monitor turns on immediately when the PC starts up, but then goes out, blinks or incorrectly transfers the picture, you should look at its configuration. It happens that someone changed the settings.

  1. Press the Menu button on the monitor;
  2. Check the basic settings;
  3. Adjust brightness, contrast, and sharpness.

Cleaning the system unit from dust

As you know, a large amount of dust and dirt regularly settles and accumulates inside computer equipment. If the computer works, and the monitor does not turn on the first time, it is quite possible that the time has come to clean the “insides” of your “iron friend”.

  • First you need to turn off the PC from the power supply and disconnect the connecting wires. Thus, you eliminate the risk of electric shock and eliminate static voltage inside the case;
  • After a complete shutdown, take a screwdriver and open the side cover of the system unit;
  • Collect dust from internal components;
  • When you collect all the garbage, remove the card;
  • Carefully clean the contacts with a pencil eraser, remove dust with a brush.
  • When you finish the cleaning, plug the adapter module back, return everything to its place and start the computer.
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Incorrectly installed graphics card drivers

Quite often, incorrect updating or installation of card drivers can lead to problems when loading Windows and difficulties when displaying images on the monitor. For example, the OS starts and freezes on the welcome screen saver, or you see a black screen. You will have to uninstall or reinstall the current software.

For diagnostics and troubleshooting, log in to safe mode. You can do OS recovery and return the old driver. After that, check if your PC will work normally.

How to reset BIOS settings?

When there are two cards on the computer or laptop (integrated and external), problems with the monitor often arise due to incorrect BIOS settings. That is, the wrong device is automatically installed in the configurations. The user needs to return the default settings. There are two ways to do this.

The first way. Clear CMOS function

  1. After disconnecting the device from the power supply, we find the Clear CMOS jumper on the motherboard (usually located near the battery, as shown in the screenshot);
  2. It is required to rearrange the jumper to an adjacent place;
  3. Press the Power button, then insert the jumper to its original position and turn on the PC;
  4. After that, the BIOS will reset the password and settings.

If you did not find the jumper, go to the next instruction.

The second option is to disconnect the battery

  1. Turn off the computer and find the battery on the motherboard;
  2. Pull it from the bar and press the power button;
  3. It remains to wait from 30 to 180 minutes;
  4. Now the battery should be reinserted, connect the computer to electricity and turn it on;
  5. The system will start loading, the message “CMOS checksum error. Defaults loaded. Press F1: to continue “;
  6. Confirm the reset by pressing the F1 key.

What to do if the motherboard is malfunctioning?

It is one of the most serious reasons. It doesn’t matter if this is a partial failure or a complete failure, you will definitely encounter a monitor malfunction and an incorrect picture display.

You cancheck the board for damage to the connectors, into which the card is connected by connecting another graphics adapter. To do this, you need to disassemble the system unit and, first, conduct a similar inspection of the motherboard. If you find broken connectors, it is recommended to contact a service center.

The same applies to the situation when burned out display. Without the appropriate knowledge and experience, it is best to call a specialist. In addition, if you bought equipment not so long ago, you should have a warranty card left, which means that you can use the services of free repair or replacement of equipment with new ones.