No signal detected on the monitor what to do

Sooner or later, almost any old computer will face the following situation: At first glance, everything is as usual when it starts up. by pressing the power button, the fans in the system unit start as usual. But this “usualness” is dispelled by the message on the monitor. no video input. In this case, of course, there is no image on the monitor. Further, this phrase can be replaced by the phrase “Power saving mode”.

In this article, we will understand the meaning of this message, as well as provide some tips on how to eliminate it and bring your computer into working order.

What does “no video input” mean on the monitor?

In order to understand the meaning of this phrase, it is enough to refer to its translation into Russian. It sounds like “No video input”. In SIMpler terms, the monitor with this message indicates that the video card does not supply an image to it.

over, the video card is not necessarily to blame, as many at first glance might think.

For advanced users

Computer turns on but shows No signal detected on monitor? What if none of the previous methods helped? Those who are confident in their abilities and are not afraid to disassemble the very heart of the computer can take care of the motherboard on their own.

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

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

When working, it is important to remember about safety precautions, do everything carefully so as not to damage the parts, and before taking any action, be sure to disconnect the computer from the network.

Sometimes everything becomes clear already when you open the lid of the system unit. The cause of the problem may be swollen capacitors. As a rule, in half of the cases, the computer monitor does not turn on for this reason. But even experienced users shouldn’t solder the parts themselves. It is better to entrust the repair to the specialists of the service center.

“No signal” on the monitor. Causes of the problem and what to do

So, below will be listed all sorts of reasons for the appearance of NO SIGNAL on the monitor screen, ranging from the SIMplest to the most complex.

  • Wrong input selected on the monitor itself.
    There is often a situation when the user accidentally pressed the VGA, DVI, HDMI input switching button and switched the monitor to an input to which nothing is connected.
    Check which input is selected on the monitor. Switch input to correct.
  • Monitor signal cable is loose, loose, or damaged
    This may apply to VGA, DVI, and HDMI connectors.
    Check the contact of the signal cable on both the monitor side and the video card side.

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 remember 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.

signal, detected, monitor

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 just 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 computer problems. 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.

So, for diagnostics you will need:

  • 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.
  • Then 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 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 short-circuit or oxidize. 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 professional help 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.

Probably, every user at least once in his life saw on the monitor screen the discouraging message “No signal”, “No video signal”, “No signal”, “Check cable” or something SIMilar. Fortunately, this does not always indicate a computer malfunction. In this article, we will list the possible reasons for the lack of a video card signal and ways to solve the problem of displaying images on the monitor.

What to do?

First of all, check the reliability of the connection of the monitor cable to the system unit. If there are adapters. remove, blow through and put back.

On some monitor models, you need to forcefully specify in the settings from which connector (HDMI, VGA, DVI) the video signal comes.

The next step will be to remove and clean the contacts of the RAM. If there are several memory plans, then remove everything and try to put one at a time in different slots.

One of the possible reasons is poor contact of RAM

From experience we can say that you need to resort to checking the video card contacts only after removing / installing the RAM. You need to carefully remove the video card from the connector, wipe the contacts with an eraser and install again.

If the problem persists, then it is better to try installing another, obviously working video card, or check yours on another computer.

Also worth trying to reset BIOS.

If a speaker is installed in the computer, then you need to remove the RAM and try to turn on the system unit without it. If it beeps, then the motherboard is alive, if not, the motherboard is most likely out of order.

External computer speaker on motherboard

No input signal on the monitor what to do

Innovative technologies are developing at an incredible speed today. But new developments also give rise to unfamiliar problems, usually associated 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.

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 solutions are there? 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 by long pressing 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 reboot, you must immediately configure power management, check the compatibility of games and programs with the capabilities of the 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.

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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 computer problems. 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.

So, for diagnostics you will need:

  • 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.
  • Then 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 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 short-circuit or oxidize. 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 professional help 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.

For advanced users

Computer turns on but shows No signal detected on monitor? What if none of the previous methods helped? Those who are confident in their abilities and are not afraid to disassemble the very heart of the computer can take care of the motherboard on their own.

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

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

When working, it is important to remember about safety precautions, do everything carefully so as not to damage the parts, and before taking any action, be sure to disconnect the computer from the network.

Sometimes everything becomes clear already when you open the lid of the system unit. The cause of the problem may be swollen capacitors. As a rule, in half of the cases, the computer monitor does not turn on for this reason. But even experienced users shouldn’t solder the parts themselves. It is better to entrust the repair to the specialists of the service center.

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?

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 “No signal” message should be sought 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 latches of the system unit, as a rule, are located on the side cover, you must 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.

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 remember 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 just one click of a button.

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 on the monitor is lit. What to do and how to diagnose the cause yourself?

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 “No signal” message should be sought 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.

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 remember 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 just one click of a button.

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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 computer problems. 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.

So, for diagnostics you will need:

  • 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.
  • Then 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 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 short-circuit or oxidize. 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 professional help 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.

For advanced users

Computer turns on but shows No signal detected on monitor? What if none of the previous methods helped? Those who are confident in their abilities and are not afraid to disassemble the very heart of the computer can take care of the motherboard on their own.

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

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

When working, it is important to remember about safety precautions, do everything carefully so as not to damage the parts, and before taking any action, be sure to disconnect the computer from the network.

Sometimes everything becomes clear already when you open the lid of the system unit. The cause of the problem may be swollen capacitors. As a rule, in half of the cases, the computer monitor does not turn on for this reason. But even experienced users shouldn’t solder the parts themselves. It is better to entrust the repair to the specialists of the service center.

The monitor writes No signal, No signal detected, Check signal cable. what does this mean and what to do?

A frequent question from users: what to do if the monitor says “No signal”, and the computer is working, and what the messages mean: No signal detected, Check signal cable, No input signal, “Check the signal. cab. “,” Signal not detected “and SIMilar. The problem can occur with any type of connection: HDMI, VGA, Display Port and DVI.

This manual details why when you turn on the computer there is no signal or “No signal detected” on the monitor, the possible causes of the problem and how to fix the situation. First. SIMple options, then. more complex, but also work in many cases. SIMilar problem: Monitor writes Out of range, Input is not supported (or Out of Range and Input Not Supported).

What does Check signal cable, No signal detected and “No signal” mean on the monitor

All of the above messages on the monitor screen have the same meaning: the video signal supported by this input is not being received at the input. The reason is the same, but the messages depending on the specific monitor may be different.

  • Checksignalcable means “Check the signal cable” (the one that connects the monitor to the computer). It may also appear as “Check Signal. cab. “.
  • Nosignaldetected means “No signal detected”.
  • Noinputsignal translates as “No input signal”.

Additional possible reasons for the absence of a signal on the monitor and possible solutions

If everything that was described above did not work, let’s move on to other possible options, also quite common:

  • If you have integrated video, try physically disconnecting the discrete graphics card, plugging a monitor into the integrated output, and see if that solves the problem. If decided, possible options: no additional power is connected to the discrete video card, hardware problems of the video card, lack of power supply unit (real power may drop due to wear and tear), problems with the slot where the video card is connected.
  • The problem in question is often described as “There is no signal on the monitor, but the computer is working.” In fact, the noise of the fans and the light of the indicators after pressing the power button does not always mean that the computer is turning on and working: in case of problems with the video card, power supply, RAM, or if some power lines are not connected to the motherboard (often during self-cleaning, assembly and disassembly, replacement of components), it can SIMply turn on the power on some lines, but not start, and also not send a signal to the monitor (at the same time, it will not play the OS boot sounds, if there were such before, but now there is no. this is an argument in favor of the described option). If other monitors are not shown on the same computer, this is another argument in favor of such a case. on this in a separate instruction What to do if the computer does not turn on.
  • If, when the computer starts booting, the monitor shows something (POST / BIOS screen, logo), and then a message appears stating that there is no signal, there is probably something wrong with the image output parameters set in the operating system. True, usually in this case it is reported that Signal is out of range (signal out of range). A possible solution, if you have Windows, is to start Safe Mode and use restore points, or boot from a USB flash drive with the same version of OS that you have installed, on the second screen select “System Restore” at the bottom left and use restore points. In Windows 10, you can get into the recovery environment after two forced shutdowns (by holding the power button for a long time, although this is not the safest technique). As a last resort, you can also resort to reinstalling the OS.

SIMple reasons that there is no signal on the monitor and how to fix it

To begin with, about SIMple and fairly common variants of the causes of the problem and the corresponding methods of solution. I recommend not to skip a single item, even if you are sure that this is definitely all right.

  • The cable is really disconnected or not tightly connected from the side of the monitor or video card of the computer: it can be accidentally touched, someone could move the monitor. Be sure to check, this is not such a rare case.
  • If you updated your monitor or video card, and then connected the monitor using an adapter or cable with different interfaces (for example, Display Port. HDMI, HDMI. VGA / DVI, and the like), remember that this cable or adapter itself may be source problems: some of them are unidirectional, some work only on certain equipment (for example, only on those video cards that support analog output via HDMI, and these have not been produced recently). The solution in this case is to try to use the connection using the same type of ports, or at least connect the digital output to the digital input; you can also purchase an active signal converter. Ideally, use the original monitor cable without adapters.
  • If you connected your computer to a second monitor, projector or TV (How to connect a laptop or computer to a TV), turn off the computer, disconnect the cable leading to the TV from the video card (even if it is disconnected from the TV itself or the second monitor), turn on the computer again and check if No signal detected or Check signal cable problem is gone.
  • If in the menu of the monitor itself it is possible to select an input signal source (item “Input”, “Input”), open this menu and try to manually select the input used.
  • If possible, connect your monitor to another computer or laptop in order to exclude a malfunction of the monitor itself or its ports: if there is no signal on the other computer either, the problem should be looked for at the level of the monitor itself.
  • If the computer previously had a discrete video card, and now you connected the monitor to the integrated one (output on the motherboard), and received as a result “No signal”, the reason may be either the disabled integrated video in the BIOS, or the priority of the PCI-E video card set there, or a processor without integrated video.
  • Some older video cards cannot output a signal to the Display Port (theoretically, the same option is possible with HDMI) until the drivers are loaded (at the beginning of the installed OS boot). What does it mean: if you just assembled a computer with such a video card or decided to reinstall the system on it by booting from a flash drive, and the monitor is connected via Display Port, there may be no signal from it.
  • If you bought a new monitor with a USB-C / Thunderbolt connection and are connecting a laptop to it, check the laptop specifications: not all of them support USB-C image output. I also recommend using the native monitor cable, USB-C cables are different and some of them may not support video / audio output to the monitor.
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Separately on the second of the above points: today, there is often a situation when a user purchases a modern video card, which has only Display Port and HDMI, but has an old inexpensive monitor, on which there is nothing but VGA / DVI, and it is then that there is no signal. This can be solved by purchasing an active converter from HDMI or DP to a monitor standard, but if possible, I would recommend changing the monitor.

Video instruction

Hopefully one of the options worked for your case. If a solution is still required, describe the situation in detail in the comments: the model of the video card, monitor, how exactly the connection was made, after which the “No signal” problem arose and what has already been tested. Perhaps a solution can be found for your situation.

No signal detected on the monitor: what to do and what is the reason? Possible problems and their elimination

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 rectify the situation, it is necessary first of all to understand the cause of the problems that arise. You can do it yourself.

General recommendations

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. Curious pets or children can also cause damage. Therefore, the first recommendation when such a problem occurs is to check the connection of all wires. When the cable is in 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 discuss the latter case in more detail later. Maybe the problem causing 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 the 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 may 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 may 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 rather complex ones, for the solution of which the intervention of specialists is required. To fix the problem, you can try the following steps:

Possible options

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 off 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. Usually 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 should you 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 steps, you must remember about safety. The main thing is to do everything carefully so as not to damage the parts. Before taking any action, you must disconnect the computer from the power supply. 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 the cases, the computer monitor does not turn on for this very reason. Even experienced users should not solder the parts themselves. It is better to entrust the repair to the specialists of the service center.

Signal diagnostics

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 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.

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