No monitor signal what to do. No Signal Detected there is no signal when you turn on the computer

What to do if there is no signal on the monitor when you turn on the computer?

This situation is undoubtedly one of the most common computer malfunctions associated with computer iron. Reinstalling programs and drivers cannot fix it. Only reinstalling, repairing or replacing the components of the system unit can help here.

In this article, we will tell you what to try to do at home to eliminate the problem when there is no signal on the monitor when you turn on the computer.

How to eliminate the problem?

Start solving a problem with an absent signal on the monitor at home is worth checking the connection of the cable from the monitor to the system unit. Also check the connection of the monitor power cable into the outlet.

If everything is fine with the wires, they are reliably connected and do not have visual damage, then you should try to remove the RAM, wipe the contacts with the Torka and insert it into place. Very often it helps and the computer turns on.

One of the possible reasons is poor contact of RAM

Also, pay attention to whether when the computer is turned on when there is any sound signals. If so, then you can compare their sequence with this table to try to find a problem by the number of BIOS sound signals.

Next, try to remove the video card, wipe the contacts on it and put it in place. Ideally, try to replace it with obviously working.

monitor, signal, detected, there, turn, computer

Sometimes there is a problem in the power supply. We advise you to remove it, check the contacts for a burning subject. Especially 4 piny, which goes to additional power supply.

If none of the above helped, then with a high probability we can say that the problem with the motherboard and it will have to be changed.

We also advise you to familiarize yourself with the following materials:

DRAM_LED burns red and no image


This phenomenon can occur for a variety of reasons. In some cases, you will have to replace the monitor or one of the components of the computer, but most often you can do with slight efforts.

There is no interesting DisplayPort signal or black screen through DisplayPort

With such a problem, one fine day, the image on the screen through DisplayPort was stopped just a black screen and that’s it, tried to change the cable (changed to the original Dell cable) did not help. over, if you connect the DVI or HDMI cable to the video card, and nothing was displayed through DisplayPort, even BIOS did not show even when rebooting. The solution was not trivial, found as always on foreign sites. I have this manifested on the ASUS GEFORCE GTX 960 Strix ideo.

Problem: There is no signal via DisplayPort or black screen. Solution: Turn off the power on the monitor for 10-15 minutes, then turn on and everything will work. The solution is not typical, t.e. It is not a fact that it will be relevant for everyone, but if the intends in the video and the working monitor should help 100%.

There may be several reasons for their occurrence:

Most often, the problem lies precisely in the fact that the PC drivers are outdated, because the equipment stops working.

Allowing this malfunction is quite simple, you can go in two ways:

  • download your own update from the official site of the equipment manufacturer;
  • Go to the “safe mode” (for this you should press F8 when starting) and perform the following actions:
  • o go to the “Device Manager” (“Start”-“control panel”);
  • o we find “monitors” and click on a non.working device twice;

If there is a connection to the Internet, the update will be carried out in automatic mode, the user participation in this will not be required. If the screen does not work in safe mode, then you need to use another display.

It also happens that there are any compatibility problems between the programs of the adapter and the PC screen. Most often, this is found after installing them.

monitor, signal, detected, there, turn, computer

To avoid the occurrence of such a situation, it is necessary to carefully monitor the changes occurring on the PC. And before installing any catalysts or similar products, make points for rollback.

Most modern operating systems are sewn with standard drivers that allow you not to waste time installing “family”. In most cases, this is a fairly convenient solution. But some models require installation of only “family” utilities.

If the PC screen does not work after the OS load starts, you should go to Windows “secure mode” and install other drivers.

The designated operation is performed as follows:

After that, it is necessary to immediately start the installation of the “native” drivers, until the activation of the PlugandPlay system. This function in automatic mode sets a standard set of instructions. After performing all the actions described above, the restart should be performed.

Applications and utilities

It happens that the guilt of the image is previously established programs and utilities. Often, many users are experimenting with new software, all kinds of utilities. They can negatively affect PC performance. In particular, the functioning of the display.

If after the installation of any new software, the image is gone, then it is worth deleting it through a safe mode.

When this action does not help, you can use the function “Restoration of the system”:

In the absence of an image on the display, you should never panic. Most often, it is quite simple to eliminate this kind of problem, the help of a specialist may be required only in any emergency situations-they happen extremely rarely.

Localize the source of the problem

The following symptoms are more likely to indicate a malfunction of the monitor:

  • When the computer is turned on, the monitor does not show any signs of life: the screen remains black, the indicator on the front panel does not burn, the case and display do not heat up.
  • The device begins to work only after repeated attempts to turn on. Sometimes. with a significant delay.
  • It turns on, but after a while spontaneously turns off.
  • He reacts to the power button, but after that they immediately turn off with the computer. When checking with another PC monitor, it works fine.

And this speaks more about external problems associated with the video card and other system units, as well as with software:

  • The monitor turns on, but instead of the image on the screen, “Power Saving Mode”, “No signal”, etc. P.
  • The screen goes out after loading Windows in normal mode, in a safe image there is. The bulb of the inclusion on the front panel of the device continues to glow.
  • The screen goes out during the game and at another intensive load on the video card. The indicator also shines.

By the way, the monitor connected to the laptop can not display the picture immediately, but only when starting the operating system. This is fine. But if the latter does not start for some reason, the image never appears. Because of this, it may seem that the external monitor does not work.

Express diagnostics

As usual, start by you can check quickly. If the monitor does not show signs of life, make sure that the power cord is reliable to join it; Connect it to another. obviously working and not overloaded electric outlet; Make sure that the cable has no internal creases (checked by bending), and its nest is obvious defects: failure inside the case, distortion, melting, etc. P.

If a notification of the absence of a signal has been displayed on the screen, check the video cable: whether it is inserted on both sides, and most importantly. is it the desired connector. It happens that users mistakenly connect the monitor not to the video card, which should display the picture on the screen, but to the motherboard.

If possible, connect the monitor and a video card by another cable through an alternative integration. If the problem has gone, then its culprit is a video cable or a faulty connector in one or both devices.

If the monitor has an external power supply, and among modern models Samsung, LG, BenQ, NEC, SONY, Acer, etc. D. Such are the majority, evaluate his condition on the following signs:

    Whether the LED indicator (if any) lights up on the block, when you insert the cord into the outlet.

The absence of an indicator reaction when connecting to an electric network and at least minimum heating when the monitor is turned on usually indicates a power supply unit. Fortunately, this problem is easily solved by replacement. Food blocks for computer monitors are easy to find on sale, for example, on Yandex Market, and they are relatively inexpensive.

The immediate shutdown of the power supply included in the network when trying to connect it to the monitor (determined by the extinguishing of the LED indicator) is a sign of a more serious breakdown: short circuit in the device scheme. It is likely that it will not work to get through small costs here. You will have to either hand over the monitor for repairs, or purchase a replacement for it.

To check if the screenshot problem is bound, use any light source, for example, a phone flashlight or a table lamp. Send it to the screen. If you see the contours of the image, then the backlight does not work.

This problem will help to solve this problem in the repair service of monitors and TV.

monitor, signal, detected, there, turn, computer

Checking cables

If the wires are damaged, it can also affect the work of the device. At the same time, it does not matter, the computer does not see the monitor through HDMI, DVI or VGA. Any of these wires can move at the most unexpected moment. Most often this happens when the cable is not screwed into the rear parts of the screen and PC, but simply inserted.

If a dedicated video card is used, then you need to make sure that the screen is connected to it, and not to the conventional mentality connector. As a rule, the system automatically turns off the full.time graphics and uses the connected device. If this does not happen, then you need to turn off the filing of the picture through the “mother” manually.


Quite often, such problems occur when the quality of the picture does not correspond to the possibilities of the monitor. In this case, the screen will not work or begin to disconnect with an enviable frequency. To solve such a problem, it is enough to restart the system and start it in safe mode. After that, it is enough to change the resolution to a lower.

However, everything is not so simple. The fact is that modern operating systems return the initial resolution after 15 seconds. Therefore, you need to press the “Save” button in time. In addition, the system can begin to resist the resolution when detecting more suitable, in its opinion, parameters.

Another situation can also occur. For example, when the monitor does not show “signs of life” with a working computer. In this case, perhaps, the user simply connected two monitors, and then turned off one of them, but for some reason the operating system did not receive this signal. In this case, it is recommended to clamp the FN button on the keyboard (usually it is on the left of the space) and press F1, F12 or another key (depending on the laptop model).

Other options

If the monitor writes No Signal Detected and does not show the operating system loading, you need to check all the screen connection to the system unit and video card. Perhaps the plug has lost contact with the connector. Then it is easy to fix the breakdown: it is necessary to insert the plug into the desired position and then restart the computer. If a positive result has not been achieved, then you should further look for the reasons why No Signal Detected on the monitor. What to do and how to diagnose the cause yourself?

The algorithm for eliminating problems is as follows:

  • Connecting a faulty monitor to another system unit or laptop. The image appeared? So, the screen is serviceable, and the reasons for the message “no signal” should be sought deeper. If the picture is still absent, the monitor can be safely carried to the service center.
  • When connecting to another device, the image appears, but nothing works with the “native” system unit? Perhaps the problem arose with a video card or with a motherboard. The video card has two connectors: DVI and VGA. You can try to change the cables in the connectors in places and turn on the computer. If the monitor still shows No Signal, you will have to open the system of the system unit.
  • The latches of the system unit, as a rule, are located on the side cover, it is necessary to carefully open them and remove the side wall. Next, you should check whether the video card is securely fixed. You can extract it and clean the connectors with an ordinary stationery eraser. After the video card is put in place and a trial launch of a computer is made.
  • In the case when the efforts did not bring a positive result to contact specialists. It may be necessary to replace the motherboard, monitor or video card.

For advanced users

The computer turns on, but shows No Signal Detiateded on the monitor? What to do in the event that none of the previous ways helped? Those who are confident in their abilities and are not afraid to disassemble the very heart of the computer can be engaged in the motherboard on their own.

Most likely, the problem lies in the gland, but first you can try to reset BIOS. There are two options:

  • Find the instructions for the motherboard (or open it on the Internet from another device) and return the initial settings by connecting certain contacts.
  • Pull the battery from the motherboard for 10 minutes, and then insert the part back and restart the computer.

When working, it is important to remember safety precautions, do everything carefully so as not to damage the details, and before taking any action, you should definitely turn off the computer from the network.

Sometimes everything becomes clear already when opening the cover of the system unit. The cause of the malfunctions can be in swollen capacitors. As a rule, in the half of the case, the computer monitor does not turn on, which is why. But even experienced users should not solder the details on their own. It is better to entrust the repair to the specialists of the service center.

Why the monitor might not see the computer?

In terms of popularity among computers, this situation is leading positions. This happens spontaneously. You turn off the computer, everything is as usual, and the very next day, when you press the power button, the system unit seems to turn on, at least the fans make noise, and on the monitor screen, instead of the usual logo of the operating system loading, the inscription “No signal” is displayed, after which, after which It turns off. Many have an erroneous impression that this monitor does not see a computer. In fact, everything is somewhat different.

In 99% of cases, this is not a monitor does not see a computer, and the computer does not give a video signal to the monitor. He, in turn, tells you about this phrase “no signal” and goes into the waiting mode.

The fact that fans began to spin in the system unit, does not mean that it turned on. When clicking on the power button, you launch a power supply unit. He gives voltage to the fans and they begin to rotate. The motherboard may not work. In this case, the signal from the video card to the monitor will also be absent.

What to do if there is no signal on the monitor?

First of all, it is worth checking the contact of RAM with the motherboard, as well as make a visual inspection of the motherboard for the presence of swollen capacitors.

One of the reasons is a swollen capacitor

To do this, turn off the computer, open the side cover of the system unit and pay attention to the RAM modules. He can be one or more. They are usually located in the upper right corner and look like this:

Bending white latches along the edges of the memory modules, remove their connectors. Next, wipe the contacts with an ordinary eraser and try to insert one into the connectors to a characteristic click.

Inserted 1 module and try to run the computer. If there is no result, then try to insert another memory module into another slot (if there are several memory planks).

Проверьте подключение кабеля на мониторе.Нет сигнала.Нет изображения.No signal detected on monitor

Your task is to try to include a computer with different memory modules in different slots separately.

It is best to try to install a 100% working memory module that you can ask friends, since very often the reason for the missing video signal on the monitor is RAM.

Next, be sure to reset BIOS. This is done by pulling the battery for several minutes from the motherboard or a closure of a special jumper.

In the absence of a positive result, you need to try to extract the video card from the connector, also wipe the contacts on it with an eraser and insert it back. Ideally, try to insert a deliberately working video card by lending it to a friend or from neighbors for example.

If the motherboard has a way out for the monitor, then remove the video card from the connector and try to turn on the computer from the video adapter.

The presence of a monitor connector on the rear wall of the computer is a chance of having a video card on the motherboard

The next step is to check the contacts of the power supply. This applies to as a 24 pine connector:

So 4 (8) pinovoy on additional food power:

Remove them from the connectors and check if there are no traces of carbonization on them.

Very rarely, but it also happens that in a similar situation, when the monitor does not see the computer, the culprit is a power supply. If possible, it is worth connecting another knowingly working power supply.

If none of the above helped you, then with a 90% probability, the motherboard and/or processor, which are not repaired in such a situation, are out of order, but are subject to replacement.

What does no signal detected mean?

If you translate this phrase into Russian, then its meaning becomes clear. “no signal”. Simply put, the video card is not submitted by the incoming video signal to the monitor and because of this it goes into the waiting mode.

But far from always the culprit of all this is the video card itself, as it might seem at first glance. This is much more common due to RAM or motherboard.

How can you try to fix it?

First of all, check the correctness and reliability of connecting the cable coming from the system unit to the monitor.

He must enter tightly from both ends. Also, if there is a and discrete video cards in the computer, the monitor cable should be connected to the discrete video card connector, which is always below the video output of the video card.

External (discrete) video card of the system unit

The back wall of the system unit with a VGA connector of a video card on the motherboard

If everything is fine with connecting the cable, then you should try to pull out all the modules of RAM, wipe the contacts on them with an eraser and try to insert one at a time, each time trying to turn on PC.

One of the possible reasons is poor contact of RAM

Next, we do the same with the video card. We take out from the connector and wipe the contact path with an eraser.

The presence of a connector for a monitor on the rear wall of a computer is a guarantor of the presence of a video card on the motherboard

If there is a video card on the motherboard, then try to connect the monitor connector to it and enable PC. Discrete video card must be extracted from the connector.

It is also worth trying to reset the BIOS settings by extracting the battery from the motherboard for 5 minutes.

Check the connectors of the main and additional power on the motherboard for darkening and burning.

If none of the above helped, then with a probability of 99% we can say that the motherboard failed and it is required to replace it.

The monitor does not turn on when starting a computer. reasons

Not to turn on the computer screen can be for a variety of reasons. And you can determine them according to the stages of computer downloading. For example, if the load stops at the stage of turning on the screen, that is, it does not respond at all to the power supply, then the matter is either in serious damage to the video card, or in the wrong connection. If the load reaches the stage of the operating system, but then for some reason the display is turned off, then drivers, a video card, and the operating system may be to blame for it. Malfunctions in the operation of one of them can cause failures and in the screen of the screen. Next, we will consider in more detail why the monitor can fail, and what to do if it does not work.

Any modern motherboard is equipped with a warning and diagnosis system. This system, before loading the operating system, checks the serviceability of all the main components that are connected to the motherboard. In case of malfunction, using the speaker, the system gives a sound signal. The number of signals (squeaks) is consistent with certain malfunctions.

In order to determine the malfunction of your computer, you need to know:

If this list of signals is absent in the instructions, then you must look at the reference sites or on the manufacturer’s website of this motherboard.

Black screen, fan makes noise, indicators are burning.

  • Reset the settings in one of the ways:
      press the Clear/Reset button (happens next to the power button or on the motherboard) for 5 seconds;
  • Remove the cmos battery from under the motherboard on the motherboard and put in place in a few minutes.
  • Replace the power battery (CR2032).

After any of these manipulations, turn on the computer to check if there is a signal on the monitor.

Faulty video card

Problem. There is a chance that your monitor is working, and the problem with the output of the image is related to the video card. It can be poorly connected or in the worst case can burn out.

Solution. The first thing to do is connect the monitor to another system unit or even to the laptop (it does not matter). If there is no other computer nearby, you can try to connect the monitor to the video card if it is available (after turning off the discrete). So we will definitely be able to check what exactly the problem is, in the video card or in the monitor itself.

If the problem is in the video card, then you can remove the lid, then pull it out and insert it back into the connector. If it has not helped, it is necessary to carry it to the service, but we will be sure that the problem is not in the monitor.


Black screen with messages like “Disk Boot Failure” or “No Bootable Device”. The system will offer to insert a disk and press a specific button.

  • Check performance by replacing it with another disc.
  • Restore (if the type of disk is HDD):
  • Download on another device or find a loading flash drive from victoria;
  • Go to the BIOS computer with a faulty disk;
  • run via Victoria and try to reanimate the disk.

If you cannot restore, then it is necessary to replace the disk.

The screen is black, the system unit does not start. The signal is not supplied not only to the monitor, but also to the rest of the components of the computer.

You can diagnose a malfunction of the motherboard only by swollen capacitors and other visible damage. To check it, you need special equipment that is in service centers.

This article discusses the main reasons that there is no signal on the monitor when the computer is turned on. Only the most obvious (the screen button is turned off are not indicated, the cable from the mains is disconnected, etc. P.) and problems arising from the installation of new or incompatible components in the computer.

The user will be able to perform simple actions himself, but complex diagnostic procedures are best entrusted to the masters. And before opening the computer, it is important to make sure that it is not under warranty.

No signal detected

Warranty equipment has the right to open only an engineer of the service center authorized by the manufacturer.

In the article, we made out the problem, no signal detected there is no signal on the monitor when you turn on the computer.