Monitor Goes Off But Computer Continues To Work

Monitor Goes Off But Computer Continues To Work

Hello! If the screen of your computer periodically goes blank, although the system unit is turned on without a good reason, then you should not look for the reason that it goes out specifically in the screen. On the “a life” The screen is affected by a huge number of factors, which we will talk about in our today’s material.

Factor One- Technical problems with the monitor itself.

If you find yourself in a situation where the screen of your computer periodically goes blank, then start its diagnosis from the most obvious places.

So, in order to make sure that the reason lies in the monitor itself you need:

1) Turn off the computer.
2) Immediately after that, launch it and watch the screen.
If, after you started the computer, the screen immediately turned on and then went out sharply, then the probable cause of the breakdown is the backlight, which is installed in the liquid crystal monitors. Perhaps they burned out.
If the monitor darkens, and when it gets hit by the light from the lamp, it becomes faded, then the reason lies in the voltage inverter.
In order to find out the specific reason for the breakdown of your monitor, you need to pull out the cable with which it is connected to the system unit. In case the window with the inscription “No signal” If it doesn’t pop up, you won’t fix it yourself. In the best case, the service will help, and in the worst, you have to fork out for a new monitor.

Factor Two. Technical problems with the adapter.

In the event that any component in the system unit fails, the monitor notifies you of this. When you turn it on, the signal is periodically interrupted.

If the problem lies in the adapter, then you need to:

1) Disconnect the system unit from electricity.
2) After a couple of minutes, open your system unit.
3) Locate the adapter inside. Stir it a bit side to side.
These actions should help. If this algorithm does not help you, then pull out your adapter and configure your computer to connect to the integrated adapter.

The third factor is a blockage of dust.

When was the last time you cleaned your system unit from dust? But this may be the reason for the malfunction of the screen.
Dust blockages interfere with the normal functioning of computer components, such as RAM and adapters. To get rid of this problem, you need a banal cleaning of the system unit.

To do this, it is recommended to use a portable USB-vacuum cleaner or some kind of soft brush.
Clean your computer from dust at least once every six months, but we advise you to do it more often.

Factor Four. Cable Problems.

This factor is one of the most common, but notice it is not as easy as you might think. With an external examination, you will probably be able to think that the wire is quite “healthy”but not always the case.

Everything is checked quite easily. just find the same wire as the one that is connected to your screen and connect it. If everything worked, then the problem is fixed!

Fifth factor- Incorrect wire connection.

In those system units that are not quite old, two types of adapters are usually installed. integrated and discrete. In the case when the wire is connected to the wrong socket, the screen, although it will feed “signs of life”but it will not work by itself.

The reason lies in the fact that the BIOS was originally programmed to give preference to a more powerful adapter. If someone mistakenly connected your monitor to the integrated adapter, then it may refuse to work.
Solving the problem is also quite simple. make sure that the monitor is connected verono. If this is not the case, reconnect it to another adapter.

Sixth factor- Technical problems with the processor or motherboard.

If the reason lies in “mothers” or processor, then the cooler will work as before, saying that the computer is in working condition, although in fact it is not.

They can solve this problem only in the service, and you should make sure that this is so. To do this, check if the red sensor under the arm is on or the keyboard is lit.

Seventh Factor. Common Life Cases.

Even that screen, which may be in full working condition, will stop working due to your inaccuracy. It is possible that you simply pulled out the wire that connects the monitor to electricity or the system unit, or simply pressed the shutdown button on the screen itself.
These malfunctions are solved quite simply, and maybe it’s ridiculous, but it’s better to be convinced once again than to complain about the components.

Graphics Card Failure

Another logical reason for constantly turning off the monitor screen may be a hardware failure of the graphics adapter. For such cases, the following is characteristic:

The appearance of various artifacts on the screen (stripes, distortions, broken lines, etc.)

Messages about driver errors that appear in the system tray.

In all modern PCs (including laptops), two graphic adapters are located on the motherboard at once: internal and external. In the BIOS settings, by default, preference is given to that card, which is considered more productive (usually discrete). Therefore, it is necessary to monitor the temperature of the external graphics module.

Discrete graphics card

In most cases, the normal operating temperature of the graphics adapter is considered to be one that does not exceed 60 degrees Celsius. But on powerful graphics cards, this is almost impossible to achieve. The maximum peak (100% load) is usually determined at 85 degrees. For individual GPUs, the peak maximum reaches 95 degrees.

For almost all existing GPUs, the maximum allowable upper limit is 105 degrees. After that, the graphics module of the board reduces the frequency for cooling purposes. But such a measure may not give a result, and then the PC reboots.

First of all, you should make sure that the card is not cooling properly. For this, there are, for example, temperature monitoring software. Consider two of them.


Launch the GPU-Z program.

Go to the Sensors tab.

If you have a discrete graphics card, then you should select it in the drop-down list. If not, then the integrated card will be indicated by default.
In the line “GPU Temperature” you can see the current temperature of the card (2).

By launching Speccy, in the main window of the program, select “Graphic devices” on the left.
Next, we look at the temperature of the desired component of the motherboard.

Design features of the laptop

Some laptop manufacturers already at the design stage of a particular model do not think up a reliable heat sink system. In such cases, laptop computers have, for example, very small grilles on the case, which logically leads to constant overheating of the entire device. Here you should take care to place any stand behind (or in front) under the laptop by lifting it.

Laptop cooling grill

Alternatively, you can use special cooling pads for laptops. They allow you to more actively drive air through the computer. There are models that work from USB, as well as having their own battery.

Portable laptop cooling pad

Loss of thermal paste properties

Heat transfer between the GPU and the cooler is carried out through a special intermediary. thermal paste (or thermal interface). Over time, the substance loses its properties, which leads to insufficient cooling of the graphics adapter. In this case, thermal grease must be urgently replaced.

Note: Parsing the adapter will void the warranty if it fails. Therefore, you should contact the official service center. If the warranty period is already behind, read the link below to replace the thermal interface for a graphic card.

All versions of Windows have a special service that disables currently unused devices. The purpose of this function is to save energy. By default in the OS, downtime is never lower than 5 minutes if it is a desktop computer or laptop. But various erroneous manipulations of the user or third-party programs can change this time by less.

Use the keyboard shortcut “Win” “X” to open the properties window.
In the menu, click on the “Power Management”.

Next, select either the link “Setting the display off” (1), or “Setting the power scheme” (2).

In the line “Turn off the display” we change the time if necessary.
Dialog box for changing monitor shutdown options when idle in Windows 8

Using the “Win” “X” key combination, we call the “Windows Mobility Center” window.
Select the power properties icon.

In the window that appears, go further. “Setting the display to turn off.”

We set the necessary parameters for turning off the monitor.

We click RMB on the desktop.
Select “Properties”.

Next, move to the screen saver tab.

We click on “Food”.

We set the necessary parameters for turning off the display.

Graphics card driver

Improper operation of the graphics driver does not often lead to the problems under consideration. But you should not completely exclude the influence of a driver conflict (or their absence) on the unstable display.

We boot the computer in “Safe Mode”.

Click “Win” “R”.
Next, enter “devmgmt.msc”.

Find the discrete card (if any) in the “Adapters” section. There should not be any yellow badges with an exclamation mark next to the name of the device.

Using RMB, click on the name of the adapter, then select “Properties”.

In the “Device Status” field, normal operation should be indicated.

Next, go to the “Resources” tab and make sure that there are no conflicts.

If the device is displayed with problems (presence of additional icons, resource conflicts, etc.), the adapter driver should be removed. To do this, do the following:

We go to the same window of the device properties, which were considered above, but already on the tab “Driver”.
Click the “Delete” button.

Confirm your decision.
Restart your computer as usual.

This method is effective for problems with the adapter drivers. But unfortunately, it does not always bring results. In difficult cases, the user will be required to manually search for and install the driver. On how to do this, read the links below.

Tip: First of all, you should find and install drivers for the motherboard (if you do not have them installed), then all the rest. This is especially true for laptop owners.

One of the most common causes of self-shutdown of a monitor is a malfunction of RAM. To detect such problems, there are special tools for checking RAM for errors. Even if a malfunction occurs in a single module, this is enough to periodically turn off the monitor while the PC is running.

RAM modules are not suitable for repair, so if you find problems in their work, you should purchase new ones.

MemTest86 is one of the best tools for testing RAM for errors. To work with it, you will need to create a bootable media with this program and set the BIOS to boot from the USB flash drive. After testing is complete, the program will display the results.

RAM check system tool

Another way to check RAM does not require additional software. The OS itself has a special tool.

To run RAM diagnostics using the Windows operating system itself, you must:

Press the key combination “Win” “R”. This will bring up the standard Run window.
Enter “mdsched” in the line.

Next, select the option to start the RAM check.

After the reboot, the diagnostic procedure starts, and upon completion of the test results are displayed.

A very common reason why the monitor turns off while the computer is running is the function of turning off the display after a certain amount of time, which is available in all popular versions of Windows. True, it is activated only if the user does not perform any actions on the PC. If this is your case, open the settings for the current power scheme and see if you have time for the “Turn off display” setting. If so, select Never from the drop-down list.

You can not discard the option with a malfunction of the monitor itself, but in this case, it will most likely remain dark or go out a few seconds after turning on the computer, although there are exceptions when the monitor screen periodically goes blank for a couple of seconds. The first may be a sign of problems with the backlight, the second. indicate a malfunction of the voltage inverter.

In order not to guess what is the matter, disconnect the monitor from the system unit. If it is working properly, the message “No signal” or “Cable is disconnected” should appear on the screen, otherwise this will indicate a problem with the display itself. If possible, try connecting the monitor to another PC.

Unstable operation of the monitor power supply

It also happens that the monitor screen periodically goes blank for 1-2 seconds, and then the image appears as if nothing had happened. This may indicate a problem with the power supply unit of the monitor, which cannot cope with the voltage drops in the network, as well as the poor condition of the cable contacts. Less likely causes of this behavior are malfunctions of the motherboard itself, a conflict between cards (it is recommended to disable one), problems with RAM (rare).

Incorrect resolution

The fact that the monitor turns off during a game or just working, sometimes it’s the wrong resolution to blame. If, using third-party tools, you set a resolution that exceeds the capabilities of the monitor, it is very possible to turn off the latter, especially when starting games. An obvious sign of incorrectly selected resolution is the message “Out of range”.

In this case, it is necessary to boot in safe mode and lower the resolution to the default set by the system.

So, today we told you about the reasons for the extinction of the monitor screen during its operation. We advise you to check all connections once again before carrying it in for repair. We hope that our material today helped you.
Peace for everyone!