No signal on the monitor when the computer is turned on

No signal detected on the monitor what to do

Today, innovative technologies are developing at a frantic pace. New developments lead to the emergence of new problems, which, as a rule, are associated with equipment settings. Questions often arise from beginners and those users who rarely use a computer. The “No Signal” message appearing on the monitor is a fairly common problem. In order to remedy the situation, it is necessary first of all to understand the cause of the problems that arise. You can do it yourself.

When the message “No signal” appears on the monitor of a personal computer, you should not immediately rush to find the phone of a computer repair technician. What can be done in this case? First of all, you need to remember what the last actions were performed with the computer. Perhaps someone just accidentally caught the cable while cleaning, or the computer was moved from place to place. Also, curious pets or children can become the cause of breakdown. Therefore, the first recommendation when such a problem occurs is to check the connection of all wires. When the cable falls into its rightful place, the problem will be solved very quickly. It is often recommended to restart the PC as well. The computer may not have started correctly. It is also worth remembering about hibernation. We will talk about the latter case in more detail later. Maybe the problem that causes the computer monitor to refuse to work is easily fixable.

No malfunction

Messages may differ depending on the monitor model. Here is a list of labels that mean the same problem. On Russian-speaking systems: “Check the signal cable”, “The cable is disconnected”, etc. On English-speaking systems: “check cable connection”, “going to sleep”; Signal out of range; “No signal detected”. To save energy, modern monitors have an automatic sleep function. In this case, the signal can be lost, because of this, these and similar inscriptions appear automatically. If the computer did not go into sleep mode, then the solution to the problem should be looked for in something else. Any of these messages can appear when the computer is turned off and the monitor is turned on. In this case, restarting the system usually helps.

Troubleshoot problems yourself

It often happens that the personal computer itself is in working order, but there is no image on the monitor, and the message “No signal detected” appears. What can be done in this case? Why does this message appear on the screen? What are the options for solving the problem? The reasons for such a problem can be different, ranging from the easiest and fixable, ending with quite complex ones, for the solution of which the intervention of specialists is required. To fix the problem, you can try the following steps:

If the message “No signal detected” appears on the monitor and the operating system is not loaded, then you should check all the screen connections to the video card and the system unit. The plug may have come loose from the connector. In this case, it will not be difficult to fix the breakdown; it will be enough to simply insert the plug into the desired position, and then restart the personal computer. If you still did not manage to achieve positive results, then you need to continue searching for the reasons for the appearance of the inscription “No signal detected” on the monitor. What should you do to diagnose the cause yourself? Here’s a troubleshooting algorithm:

  • You can try to connect the faulty monitor to another system unit or laptop. If the image appears, then the screen is functioning normally, and the problem needs to be looked deeper. If the picture does not appear, then you can safely carry the monitor to the service center.
  • When you connect to another computer, the image appears on the screen, but the monitor does not work with the “native” system unit? The problem might be with the graphics card or motherboard. A video card usually has two connectors: VGA and DVI. You can try swapping the cables in the connectors, and then turn on the computer. If the “No signal detected” message is still on on the monitor, you will have to open the case of the system unit. Typically, the system unit latches are located on the side cover. It is necessary to carefully open them and remove the wall. After that, you need to check if the video card is securely fixed. You can remove it and try cleaning the connectors with a regular stationery eraser. After that, you need to install the video card in place and try to start the computer again. In the event that the efforts do not bring a positive result, it would be better to turn to specialists for help. You may need to replace the video card or motherboard.

Instructions for advanced users

Suppose the computer turns on, but the message “No signal detected” appears on the monitor. What to do if none of the previously described methods helped? If you are confident in your abilities, then you can try to tackle the motherboard yourself. The problem most likely lies in the hardware components, but first you can try to reset the BIOS. There are two options here.

When performing these actions, you must remember about safety. The main thing is to do everything carefully so as not to damage the parts. Unplug your computer before taking any action. In some cases, immediately after opening the lid of the system unit, everything immediately becomes clear. The cause of the malfunction may be swollen capacitors. In half of the cases, the computer monitor does not turn on for this very reason. Even experienced users should not solder parts on their own. It is still better to entrust the repair to the specialists of the service center.

You can also fix the breakage using the speaker. This is the name of a small device that connects to the motherboard. With the help of sound signals, the speaker warns of problems with the computer. The list of beeps and their meanings will differ depending on the computer model you are using. See the motherboard manual for a complete list. For diagnostics, we will need to clarify the BIOS version of the motherboard in the instructions and familiarize ourselves with the list of sound signals from the speaker. After that, it will be necessary to disconnect all components from the motherboard, except for the processor, power supply and indicator button. Then you need to turn off the computer and listen to the speaker’s signals. To decode audio signals, you must use the list. If the sound signal differs from those presented in the list, then the problem may lie in faulty RAM connectors. Also, the reason may lie in the system bus or memory controller. After that, you need to connect the RAM to the board. The computer is turned on again and the speaker’s signals are checked. The speaker should signal that the video card is missing or not connected. If the speaker indicates a malfunction related to the RAM, you will need to check it. After that, you need to check the connection of the video card. If the speaker emits a signal about the absence of a video card, then you will need to check its connectors, They could oxidize or short-circuit. You can also try cleaning the inputs with an eraser. If there are traces of a short circuit, it is better to entrust the repair of the device to specialists.

Innovative technologies are developing at an incredible speed today. But new developments also give rise to unfamiliar problems associated, as a rule, with the settings of technology. Questions usually arise from beginners or those who, in principle, rarely use a computer. A common problem is the “No Signal” message on the monitor. To fix the situation, it is important to understand the reason. You can do this yourself.

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General recommendations

You should not immediately look for the phone of a programmer or a computer repair technician if the message No signal detected appears on the monitor. What to do in this case? The first step is to recall all the recent actions that were performed with the computer. Perhaps, while cleaning, someone accidentally hooked on the cable, the PC was disassembled or moved. Children or curious pets can also cause breakdown. Therefore, the first recommendation is to check all wires. The problem will be solved very quickly when the cable falls into place.

It is also often recommended to simply restart the computer. The PC may not start correctly, do not forget about the sleep mode. about the latter case. below. It is possible that the problem in which the computer monitor does not turn on can be eliminated with literally one click of a button.

Speaker signal diagnostics

You can try to fix the breakage with a speaker. this is a small device that is connected to the motherboard. The speaker beeps to warn of problems with the computer. The list of sound signals and their decoding differs depending on the computer model: the complete list can be found in the instructions for the motherboard.

  • Specify the BIOS version of the motherboard in the instructions, as well as familiarize yourself with the list of sound signals from the speaker.
  • Disconnect all parts from the motherboard, leaving only the processor, power supply and indicator buttons.
  • After that, the computer should be turned off and listen to the speaker signals. Sound signals are decoded according to the list.
  • If the beep is different from what is listed, faulty RAM connectors may be a potential problem. Also, the reason may be hidden in the memory controller or system bus.
  • Next, RAM is connected to the board. The computer is turned on again and the signals from the speaker are checked. It should signal that the video card is not connected or missing. If the speaker indicates a malfunction with the RAM, then it needs to be checked.
  • Then you need to check the connection of the video card. If the speaker signals its absence, it is necessary to check all the card connectors, they could be shorted or oxidized. You can clean the inputs with an eraser. If there are traces of a short circuit, contact a specialist. It is also necessary to check whether the elements of the video card have burned out: the radio elements, if desired, can be replaced independently, but if the microchip is out of order, then you will have to buy a new video card.
  • If the speaker signals about problems with the south bridge, then the help of professionals is needed. This problem cannot be dealt with at home.

Any diagnostic method requires attention and accuracy in work. Do not neglect safety precautions, and in case of serious or incomprehensible breakdowns, it is better not to repair the computer yourself, but to seek help from specialists.

This problem will sooner or later be expected on almost any computer and laptop. It’s just a question of time.

When you turn on your device, the phrase “No signal detected” appears on the screen instead of the usual image of the initial splash screen and the Windows boot logo. Then the monitor goes into standby mode, although the system unit seems to be working. In fact, this is not the case at all. The fans simply rotate in it, since they are supplied with voltage by the power supply.

In this article we will tell you what “No signal detected” means on the monitor when you turn on the computer, why it happens and how you can try to solve this problem yourself at home.

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 does not supply the incoming video signal to the monitor and because of this, it goes into standby mode.

But the video card itself is not always the culprit for all this, as it might seem at first glance. Much more often this happens due to RAM or motherboard.

Self-help troubleshooting

It often happens that the PC itself is in working order, but there is no image, and the No signal detected message is displayed on the monitor. What to do in this case, why does the message appear, and what options are there to fix the problem? The reasons can be different: from the easiest and fixable on their own to complex ones, when you cannot do without the help of specialists.

You can try to fix the problem by taking the following steps:

  • The computer and the screen turn on, work normally, but after a while the message “No Signal” appears? Most likely, the PC just went into sleep mode, and in order to “wake it up”, you need to click the mouse or press the space bar. Sleep mode settings can be changed in Control Panel (Power Options icon).
  • If there is no reaction to the previous actions, you should try to restart the monitor mechanically. by pressing the “Restart” button or twice on “Shutdown”.
  • In the event that the message is still displayed, you need to restart the computer with a long press on “On / Off.” or using the emergency restart button on the system unit.
  • If you receive a message about no signal while starting a game or program, or after the computer is idle, the problem may be that the monitor does not support the resolution of the screensaver or game.

After a successful restart, you must immediately configure power management, check the compatibility of games and programs with the capabilities of your computer, and set the resolution to the value recommended by the system. In Windows 10, the above settings can be found under Settings. System. Display and Power & Sleep tabs. For Windows 7, the path is as follows: Start menu. “Control Panel”. “Power Schemes”. The changes must be saved and then rebooted again.

No malfunction

Messages may differ on different monitor models. The following labels indicate the same problem:

  • check the signal cable on Russian-speaking systems;
  • going to sleep;
  • signal out of range;
  • check cable connection;
  • no signal detected (on the Benq monitor, such a sign appears most often);
  • cable disconnected and others.

Modern monitors have an automatic sleep mode to save energy. In this case, the signal may be lost, which is why these and similar inscriptions are displayed. If the computer still has not entered sleep mode, look elsewhere for a solution.

Also, any of these messages can appear when the computer is turned off and the monitor is working. As a rule, restarting the system helps.

Other options

If the monitor says No signal detected and does not show the operating system is loading, you need to check all the screen connections to the system unit and the video card. The plug may have lost contact with the connector. Then it is not difficult to fix the breakdown: you need to insert the plug into the desired position and then restart the computer. If it was not possible to achieve a positive result, then you should further look for the reasons why No signal detected is lit on the monitor. What to do and how to diagnose the cause yourself?

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The troubleshooting algorithm is as follows:

  • Connecting the faulty monitor to another system unit or laptop. Does the image appear? This means that the screen is working properly, and the reasons for the message “No signal” should be looked deeper. If the picture is still missing, the monitor can be safely carried to the service center.
  • When you connect to another device, the image appears, but nothing works with the “native” system unit? Perhaps the problem is with the video card or with the motherboard. The video card has two connectors: DVI and VGA. You can try swapping the cables in the connectors and turn on the computer. If the monitor still shows No signal, then you will have to open the case of the system unit.
  • The system unit latches, as a rule, are located on the side cover, you need to carefully open them and remove the side wall. Next, you should check if the video card is securely fixed. You can remove it and clean the connectors with a regular stationery eraser. After the video card is put in place and a test run of the computer is done.
  • In the event that efforts have not brought a positive result, it is better to contact specialists. Replacement of motherboard, monitor or video card may be required.

Defective monitor

Unscrew the screws of the monitor plug from the connector that supplies the signal from the video card of the system unit, remove it. If the screen lit up the inscription: “No signal” (it may be in English), then everything is in order with the monitor. If he burned down, he would not even show this inscription.

If you have the possibility that try connecting your monitor to your TV. The easiest way to do this is with an HDMI cable.

Main reasons

If, when turned on, your computer boots up, emits normal sounds, a blinking red light on the front panel indicates ongoing processes, but there is no image, the operating system will boot and the computer will work normally, but you cannot see it, as you cannot use it. There are actually quite a few reasons that may be. Here are the main ones:

  • malfunction of the monitor itself;
  • there is no contact in the connector of the video card with the monitor cable;
  • BIOS crashed;
  • problems with the RAM board;
  • the video card is faulty;
  • defective motherboard;
  • defective computer power supply.

Consider how you can correct the situation or identify a breakdown in each of the cases at home.

Attention! All of the following actions should be performed only if the system unit is disconnected from the power supply!

Connector pins problem

The actions are the same as in the first case. The connector from the video card to the monitor can be (in most cases) of three types: VGA (blue), DVI (white-gray or black) and HDMI (Black). You can read more about connectors and other characteristics of the monitor here.

Unscrew the connector screws, remove the plug, insert it back and screw it back on. Turn on your computer. If it doesn’t work, go ahead. Try plugging the cable into a different connector or use an adapter. Perhaps a banal replacement of the cable will help, i.e. if possible, be sure to try a different cord.

Perhaps we just came across a loose connector, so push the plug and see if there will be a result.

BIOS problem

Otherwise, the software for the motherboard is called BIOS. If you have problems with it, you can easily return it to its factory settings.

To reset the settings, you can short-circuit the contacts (to.) with a screwdriver or wait ten minutes. Then insert the battery back and start the computer. If the image appears, the problem is resolved. If there is still no signal to the monitor, then go ahead.

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

Hello everyone! Probably many of you have come across a situation where there is no signal on the monitor when you turn on your computer. Any PC user can face such a problem. But what could be the reason that the display remains dark when the system unit starts up? What to do in such cases? We’ll figure out.

RAM problem

Slots (connectors, in Russian) of RAM modules (boards) are usually located to the right of the processor (a massive square with a heatsink and a fan). In any case, they cannot be confused with any other motherboards. It can be one module for several gigabytes, or it can be several for 1 or 2 gigabytes.

Press the tabs on both sides of the board by pulling it out of the connector. Clean the contacts thoroughly. For this, a regular student eraser (eraser) is suitable. Slide the module back into place. Start the car. If an image appears, then the problem has been resolved. If not, it’s a good idea to try replacing the RAM card with a new one. You can borrow it from friends for a while. Otherwise, you will never be sure that your RAM is “normal”.

It is easier when there are several boards. After taking out and cleaning everything in turn, do not put everything in place at once. Identify a non-working board using the elimination method. Insert three, and then, in turn, change the boards. We put in three, turned on the computer. The display does not work. Turned off the computer. They took out one, replaced it with another, turned it on again. If during these operations the display starts to show the load, the card that remains not connected is inoperative. It should be replaced with a new one.

In the end, try using a different slot if the characteristics allow it, as it can often be the problem.

If everything remains unchanged and when the computer is turned on, the display remains dark, go ahead.

Malfunction of the video card

If the video module is built into the motherboard, then you have a direct road to the service center. You cannot check it. If it is separate, you can replace it with another one. It happens that the built-in video module is weak, and people buy a separate, more powerful one. Although sometimes it will be enough to go over the contacts of the video card with a brush. There are times when the problem lies in the settled dust.

Disconnect the monitor cable from the video card connector. Remove the video card from its slot. To do this, you need to unscrew the fastening screw at the rear wall housing and squeeze the clip (plastic lock) on the right side (sometimes it may not be there).

Then connect the connector from the cable that goes to the monitor to the output of the integrated video card, usually located above. It is the same color and the same shape. Start your computer. If the image appears, the problem was with the removed video card.

Attention! If you do not remove the additional video card from the slot, but simply switch the monitor cable to the built-in one, it will not work. The system will only launch the built-in module when it does not recognize another video card in the slot.!

On motherboards without a built-in video module, you can identify a malfunction by replacing it with another one. Also, as is the case with the built-in video card, if people are not satisfied with the power of the video module and they buy a more powerful one. Replace it with the one that stood before. If the image goes, your more powerful card is “covered”. If the display is “silent” further, then the problem is more global.

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Power Supply

Black screen, no lights, no noise from the fan. the computer is not working. Sometimes whistling or burning smell may be heard.

  • the power supply does not work. you can determine by replacing it with another;
  • the power supply is not compatible with the components. if you install a more powerful one, the image will appear.

Why the monitor may not see the computer?

In terms of popularity among computer breakdowns, this situation occupies a leading position. It 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 are noisy, and instead of the usual logo of the operating system boot, the message “No signal” is displayed, after which it turns off. Many people have the mistaken impression that the monitor cannot be seen by the computer. In fact, everything is somewhat different.

Periphery state

To make the motherboard work, it is enough to connect a RAM module, a processor, a fan for cooling and SMPS to start. The rest, including the HDD or optical drive, is used to expand the functionality of the PC.

Accordingly, there may be enough devices inside the system unit that are not required for the correct operation of the motherboard. Therefore, you need to check how the computer will behave after removing the additional components. The reason may lie in the wrong power supply. Of course, all the necessary components must remain.

The procedure can be performed in stages. one by one, removing the elements. This will also make it possible to identify a faulty element if a video signal appears after disconnecting one of them. In case the video did not appear, you need to proceed.

BIOS problem

Otherwise, the software for the motherboard is called BIOS. If you have problems with it, you can easily return it to its factory settings.

Somewhere in the area of ​​the video card slot (sometimes higher, sometimes lower, depending on the characteristics of the motherboard) there is a flat battery, from which the BIOS is “powered”. If this battery has not been changed for a long time (4 or more years), you can completely replace it with a new one. If the computer was purchased relatively recently, simply wring out the contact, remove the “coin” battery from the connector.

To reset the settings, you can short-circuit the contacts (to.) with a screwdriver or wait ten minutes. Then insert the battery back and start the computer. If the image appears, the problem is resolved. If there is still no signal to the monitor, then go ahead.

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

The first step is to check the contact of the RAM with the motherboard, as well as to 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. It can be one or several. They are usually located in the upper right corner and look like this:

Pull up the white latches on the edges of the memory modules and remove their connectors. Next, wipe the contacts with an ordinary eraser and try to insert into the connectors one at a time until a characteristic click.

We inserted 1 module and try to start the computer. If there is no result, then try inserting another memory module into another slot (if there are several memory sticks).

Your task is to try to turn on the computer with different memory modules in different slots separately.

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

Next, be sure to reset the BIOS. This is done by pulling out the battery for a few minutes from the motherboard or by closing a special jumper.

If there is no positive result, you need to try to remove the video card from the connector, also wipe the contacts on it with an eraser and insert it back. Ideally, try to insert a known working video card by borrowing it from a friend or neighbors, for example.

If the motherboard has a monitor output, then remove the video card from the connector and try to turn on the computer from the built-in video adapter.

The presence of a monitor connector on the back of the computer. the chance of having a built-in video card on the motherboard

The next step is to check the contacts of the power supply. This applies to both 24 pin connectors:

So also 4 (8) pins on the additional power supply of the processor:

How to Fix Computer No Display or No Signal on Monitor

Remove them from the connectors and check for any traces of charring.

It is very rare, but it also happens that in a similar situation, when the monitor does not see the computer, the power supply is the culprit. If possible, you should connect another known working power supply.

If none of the above helped you, then with a 90% probability the motherboard and / or processor failed, which in such a situation are not repaired, but must be replaced.

Checking the status of the video cable

This method is used when there is no video signal on the monitor, but the computer itself is running. Therefore, you must first make sure that the video cable is connected correctly. Most often, when contacts go away and a corresponding message appears.

This is especially true in the case when the computer was assembled on its own. then you should make sure that all system components are connected correctly.

The next step, if everything is connected correctly, will be pressing the NumLock (CapsLock) button several times.

If the buttons flash after pressing, the problem lies precisely with the wire or the monitor. You can check this by connecting the computer with a different cable. If it is not at hand, you can try to connect to a TV or other monitor.

It may sound trite, but if there is no signal through the VGA connector, you should secure the output with two screws. The reason is so simple that not everyone will pay attention to it.

Also, it will not be superfluous to check if the correct signal source is selected. Ideally, of course, this should be done first.

Battery Manipulation CMOS

The CMOS battery is used as a small power supply on the motherboard. Therefore, it saves parameters. date and time, download properties, video signal arrival order and much more.

signal, monitor, computer, turned

There are times when this element is discharged and does not charge, and the computer does not start because of this. Therefore, it will not be superfluous to remove it and try to turn on the computer. If it starts, the battery needs to be replaced and then restored to BIOS settings.

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