What to do if there is no signal on the monitor. There is no signal on the monitor when you turn on the computer Signal is not detected on the monitor what to do
Any technology does not last forever and sooner or later it can fail. But sometimes it’s not a matter of its failure, but of settings that the average user may not even know about. If you are wondering what to do if there is no signal on the monitor when you turn on the computer, you have come to the right page. Today we will try to tell you about the main reasons why it may be missing and how to fix it.
Causes
Let's first go over the main reasons that may affect the result that is undesirable for us - the absence of a picture when the PC is already running. So this is:- Monitor failure;
- Failure of the video card on the computer;
- Junk cable;
- Incorrect settings.
If this is present, it means that the display is working correctly and the problem is most likely not related to its failure. Unless the input where the cable is connected has failed. Therefore, to begin with, we recommend trying to connect the cable to a different socket - modern monitors often have several of them.
What to do if the monitor displays a message about no signal?
The presence of a message is good, it means it works and there is a picture! All that remains is to figure out the reason why it is missing. Most often it is incorrect settings. Most likely, the external display was unable to automatically detect the signal source and must be found manually. To do this, you should click on the “Input” or “Source” button and select the channel through which it is connected to the computer.But the problem may also be in the RAM, perhaps one of the RAM sticks is faulty, or was installed incorrectly, check and try.
Faulty video card
If you are sure that you have configured the correct source; If you are sure that the cable is not “broken” and is working correctly, it makes sense to think that the video card has failed.Checking its functionality can be done in two ways:
We also advise you to try connecting the video card using a different input. On modern chips there are several of them - up to HDMI. You may need to get a VGA to DVI adapter or a new cable if you don't have one. It’s extremely rare, but it still happens, so it’s worth a try. 
How to check if your monitor is faulty?
Even though you see a message indicating no signal on the display, the monitor may be faulty. How? For example, due to a broken/burnt entrance.If you tried to switch between image sources using the “Input” or “Source” button and did not see the result, it makes sense to take the monitor to a specialist. But to know for sure that the problem is there, you can connect your PC to the TV - all new TVs readily work with computers and are equipped with the necessary inputs.
If everything works, then the problem is in the monitor. Take it to a service center. Perhaps the problem can be easily fixed and you won’t have to spend a lot of money.
First of all, you need to make sure that the means of connecting the monitor to the power supply and to the computer are working properly. There may be no signal if the integrity of the power cable or connection is broken. It is worth re-disconnecting and connecting all the cables; if there is still no signal, you can change the cables to others. They are consumables and their cost does not exceed a couple of hundred rubles. You can purchase them at any computer store or office equipment store. If there is no signal anyway, then the reason for its absence lies much deeper.Faulty drivers
Often, due to incorrect installation of programs or due to the activity of malware, the drivers responsible for the operation of the monitor are damaged. They need to be reinstalled. But for this you will need to use another monitor. His role can be played by or, as well as simply. Before installing any driver, it is recommended to make a system restore point if the installation fails.The cost of a new LCD monitor can range from 1,500 to 10,000 rubles. Repairing a monitor can cost several thousand, so the user is free to choose between repairing and buying a new monitor.
Physical malfunction of the video card
For an initial analysis of a video card malfunction, just look at it. It may be very dusty, the cooling fan may spin slowly or not spin at all. You can also see the state of the transistors on the surface of the board. If they are faulty, they will either leak or be swollen.If the video card appears to be fully functional, then it may need to be diagnosed. It can be carried out at a specialized service center. A computer with a faulty video card can be repaired under warranty. The same may apply to a separately purchased video card. But if the warranty has expired, you will have to repair the video card at your own expense.
Monitor diagnostics
To correctly diagnose the monitor’s condition, it must be taken to a service center. The average user can remember whether there was excessive flickering of the monitor before it broke down, perhaps there was noise or an unpleasant odor coming from it.Most often, if the monitor is broken, it simply does not turn on, which means there may not be a message about the absence of a signal. But if it is there, then this indicates a partial malfunction of the video output.
If the monitor is under warranty, then it can be repaired. Otherwise, you will have to fork out a lot of money. If repairs are beyond your means, you can purchase a new monitor. Often the cost of repairs is much higher.
What to do if the signal on the monitor disappears
Nowadays, most people have their own personal computer at home or at work. Along with its positive characteristics, this smart unit sometimes experiences various malfunctions, including serious breakdowns. The fact is that a computer is a rather complex electronic system. Therefore, it is often difficult or impossible for people who do not understand this industry to understand why a computer failure occurred. One of these failures may be the disappearance of the video signal on the monitor. This breakdown can be absolutely trivial, or it can affect the replacement of expensive and important components of the system unit. Let's consider this case.
During the next boot or reboot of the computer, for some unknown reason your monitor goes blank. After multiple reboots, you see that the monitor does not light up, and the message “ No signal, check the cable».
The very first thing you need to do is stop panicking. In this case, it is necessary to find the cause of this breakdown or defect. If there is no signal on the monitor, you must carefully check the condition of the power cables, as well as the cable connecting the monitor to the system unit connector. In this case, there may be different options. Maybe for some reason the plug does not make contact with the connector. If the plug is skewed or missing from the connector, you must carefully connect it to the correct connector. If this was the problem, then the screen should blink, switching to energy-saving mode. Next, the indicator on the monitor should light up green, and then orange. After the indicators light up, you need to restart your computer. After clicking reboot, after a few seconds the screen should display a picture of the system loading.
If the monitor does not respond, move on to the next step. To do this, you need to have a system unit speaker. The speaker is a small speaker or a small tweeter, which, together with the indicators and buttons of the case, is connected to the motherboard.
You need a speaker to diagnose internal components located in the system unit. If you haven't changed your BIOS settings, then your beeper or speaker should be enabled by default. Otherwise, you need to reconfigure the BIOS in order for the speaker to be turned on.
Let's consider the essence of the speaker in system diagnostics
Any modern motherboard is equipped with a built-in warning and diagnostic 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, the system gives a sound signal using the speaker. The number of signals (squeaks) sent corresponds to certain faults.
In order to determine the problem with your computer, you need to know:
- motherboard BIOS version (written in the motherboard instructions);
- a list of signals of all faults (recorded in the motherboard instructions).
If this list of signals is not in the instructions, then you need to look at the help sites or on the website of the manufacturer of this motherboard.
Let's look at verification actions using a speaker
First action
It is necessary to disconnect all its components from the motherboard. In this case, you should leave the processor, power supply and system unit case indicator buttons connected. After these steps, you should turn on the computer. The speaker should sound a signal that warns of the lack of RAM. Next, you need to check this signal with the list. If the signal differs from the required signal, the malfunction may lie in the motherboard connectors intended for RAM. The problem may also be in the system bus or RAM controller. If everything is correct, you need to move on to the second step.
Second act
Necessary connect RAM to motherboard. Then you need to turn on the computer. The speaker should make a sound indicating that the video card is not connected. If there is a signal about a faulty RAM, it is necessary to diagnose it. The causes of RAM problems may be a defect in its strips, a defect in the operation of the RAM controller located in the motherboard, or a breakdown of the connectors. In this case, the best option would be to replace the motherboard. The fact is that this repair will not guarantee the absence of subsequent breakdowns and is quite expensive. If the signal matches the list, we proceed to the third action.
Third act
You need to connect a video card. Then turn on the computer. The computer signals that the video card is not connected. In this case, you need to check the video card connector. The check is carried out for signs of short circuit or oxidation. Traces of oxidation can be cleaned, but if there are traces of short circuiting, the connector can be considered inoperative. In this case, it needs to be unsoldered or the motherboard replaced. If the connector is clean and functional, you need to check the contacts of the video card. In case of oxidation of the contacts, it is necessary to lightly clean them with a stationery eraser so as not to damage the coating. You should also check the video card components for burnout. Replacing a damaged small radio element on a video card can take place, but failure of the microchip means that the video card needs to be replaced.
If the speaker gives the signal “problem with the south bridge”, then you need to contact the service center.
When there are no signals You need to check the connection connectors on the video card and on the monitor. To do this, you need to take an additional monitor and video card. In this case they should work. To check the video card connectors, you need to install a working video card. To check the connectors on the monitor, you need to connect a working monitor to the system unit.
In addition to the problems listed above, there may be problems with wires. They could be damaged by your pets, small children, or you yourself could accidentally touch and damage the wiring. In this case, it is necessary to replace the monitor connection cable
If after all the checks carried out there is no signal on the monitor, then a failure may occur power unit. The fact is that during a reboot, microshorts occur in the power supply. It is possible that some radioelements could not survive these microcircuits. As a result of this, the power supply stopped producing the necessary power to operate the video card. Due to this, the video card could stop working. In this case, you can disassemble the system unit and look at it for carbon deposits and swollen capacitors. This most often happens with old power supplies.
There is a problem when you turn on computer see that no signal on the monitor. The main reason why the message is displayed on the monitor screen "No Signal" or "Check Video Cable" This is a minor or possibly critical hardware error.
So, let's figure out why there is no signal on the monitor;
Solution #1 - Checking the external cable
If there is no signal on the monitor, but the computer works, try this method.
Now the first thing you need to make sure your monitor is working is - This is to check the video cable if it is connected correctly. In most cases, it is because of cable failure that people encounter this problem.
If any of you I assembled the computer, there is no signal to the monitor, double-check that the video cable and other system components are connected correctly.
If everything is connected correctly and The monitor does not see the computer, it says no signal, then the second thing you need to do is - Press the NumLock or CapsLock key a couple of times and check if the NumLock indicator is blinking
on keyboard.
If you don't have a spare video cable, try connecting your cable to another monitor or TV to see if it's causing the problem. no signal to monitor.
Solution No. 2 - Check the video card if the monitor says no signal.
Video card Usually installed on the PC motherboard as an additional component of the motherboard. The good thing about a discrete card is that it can be easily upgraded/replaced.
So now the second thing you need to check to troubleshoot your computer is your graphics card. The reason we are testing the card now is because it handles the entire graphics process and displays graphics to the computer user.
In case you do not have a graphics card installed in your computer, you can skip this step because the graphics process of your computer is controlled by the motherboard chip and we will talk about the motherboard later in this article.
If you have never cleaned your graphics card It's possible that the gold contacts on your card may have some corrosion.
Many different GPU errors can occur: for example the GPU fan is not working or perhaps the GPU needs powerreballingSo now comes the time when you need to remove the card from your PC's motherboard(for troubleshooting purposes only). And make sure you wear anti-static wrist straps with ESD grounding .
Now you need to take your favorite screwdriver and open the case of your computer to find the graphics card installed in it. Before you start anything, make sure you remove all the peripheral device cables and then place the computer case on a table and start removing the side cover screws.
After this, you will need to remove the card from your PC case, which is mainly installed in PCI x16 slot and is held PCI card holder .
Once you've successfully removed the card from your computer, it's time to connect your monitor's video cable directly to your motherboard's video port (VGA/HDMI/DVI) and try to start your computer again. If your computer works after removing the card, the card may be faulty or may need cleaning.
In most cases, the graphics card only needs proper cleaning to ensure the correct physical connection between the motherboard to function correctly. To do this, you can use a screwdriver to remove the card cooler and remove all the dirt from it using an air heater or blower. After that, dip a cotton swab in 99% isopropyl alcohol and start cleaning your GPU.
Solution #3 - Check the internal hardware
The motherboard only requires RAM , CPU , processorfan And SMPS for start. All other things like HDD And DVD-RW just needed to increase productivity .
There is a lot of extra hardware in your computer case that has nothing to do with running your motherboard. So, it's time to remove all those extra components and run the motherboard using only the hardware needed to run it.
After this, you can try turning on your computer and if it boots normally, it means that your computer has a problem with one of the additional internal hardware pieces that you need to check.
You can do this by checking all the hardware parts, disabling them one by one. If your display still doesn't show anything, just move on to the next solution.
Solution #4 - Checking the CMOS Battery
CMOS The battery serves as a small power source for motherboard, so it can save the current date or time setting, boot settings, etc.
It is possible that the battery CMOS your PC has run out of power and is preventing the computer from starting normally. In this case, you can remove the CMOS battery and try to start the computer again. If it starts normally, please replace the motherboard CMOS battery and then restore all BIOS settings.
Solution #5 – Checking RAM
Most people fix this problem using this step. 90% of display errors occur only due to faulty RAM.
In case your computer has two RAM sticks installed, you can try to remove one of them and then turn on your computer. If your computer still doesn't work, simply remove the RAM from its slot and install another one in the same RAM slot.
You can also borrow a compatible stick from one of your friends if you don't have working RAM to test with.
If you find that your RAM is faulty, don't be discouraged. In 80% of cases it can be restored by simple cleaning.
Solution 6 – Finally, check the power supply/CPU/motherboard
If The computer is working, but the monitor says no signal then everything is fine, you just didn’t complete one of the previous steps.
You can't test basic equipment without professional machines. So, the only thing you can do is test your processor on some working motherboard (compatible with your processor). If the processor works well on another computer, simply move on to other major pieces of hardware such as the motherboard and power supply and test everything until you find the faulty hardware.
In contact with
Today, innovative technologies are developing at a breakneck 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 correct the situation, you must first understand the cause of the problems that arise. You can do this yourself.
When the “No Signal” message appears on your personal computer monitor, you should not immediately rush to look for the phone number of a computer repair technician. What can be done in this case? First of all, you need to remember what last actions were performed on the computer. Perhaps someone simply accidentally snagged the cable while cleaning, or the computer was moved from place to place. Curious pets or children may also cause the breakdown. Therefore, the first recommendation when a similar problem occurs is to check the connections of all wires. When the cable is in its rightful place, the problem will be solved very quickly. It is often also recommended to restart your PC. The computer may not have started correctly. It is also worth remembering about sleep mode. We will talk about the latter case in more detail later. Maybe the problem that is causing your computer monitor to refuse to work is easily fixable.
No fault
Messages may vary depending on your monitor model. Here is a list of inscriptions that mean the same problem. On Russian-language systems: “Check the signal cable”, “Cable is disconnected”, etc. On English-language systems: “check cable connection”, “going to sleep”; "signal out of range"; “no signal detected”. To save energy, modern monitors have an automatic sleep mode function. In this case, the signal may be lost, which is why these and similar inscriptions automatically appear. If the computer does 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 on. In this case, restarting the system usually helps.
Solving problems yourself
It often happens that the personal computer itself is in working condition, 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 options exist to solve the problem? The causes of such a problem can be different, ranging from the simplest and fixable to quite complex, the solution of which requires the intervention of specialists. To resolve the issue, you can try the following steps:
— The computer and screen turn on and work normally, but after a while the message “No Signal” appears. Most likely, the computer simply went into sleep mode. To wake it up, just press the space bar or click the mouse. You can change the sleep mode settings in the Control Panel.
— If there is no reaction when performing the previous action, you can try to mechanically restart the monitor by pressing the “Restart” button or the “Shutdown” button twice.
— If the message continues to appear, you must restart the computer by long pressing the “On/Off” button. or using the emergency reboot button on the system unit.
— If a message appears about no signal while launching a program or game, or after the computer is idle, the problem may be that your monitor simply does not support the resolution of the game or screensaver. If the reboot is successful, you should immediately configure power management and check the compatibility of computer games and programs with the capabilities of the computer. If necessary, you will need to set the resolution value recommended by the system. In the Windows 10 operating system, all the above settings are located in the “Options” menu - “System” - “Display” and “Power and Sleep” tabs. For the Windows 7 operating system, you must use the following path: Start menu - Control Panel - Power Options. The changes made must be saved, and then restart the PC again.
Possible options
If the message “No signal detected” appears on the monitor and the operating system loading is not displayed, then you should check all connections of the screen to the video card and the system unit. The plug may have become disconnected 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 were unable to achieve positive results, then you need to continue searching for the reasons for the appearance of the “No signal detected” message on the monitor. What should you do to independently diagnose the cause? Here is a troubleshooting algorithm:
- You can try connecting the faulty monitor to another system unit or laptop. If the image appears, then the screen is functioning normally, and you need to look deeper for the problem. If the picture does not appear, then you can safely take the monitor to the service center.
- When connecting to another computer, the image appears on the screen, but the monitor does not work with the “native” system unit? The problem may be with the video 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 still appears on the monitor, you will have to open the system unit case. Typically, the system unit latches are located on the side cover. It is necessary to carefully open them and remove the wall. After this, you need to check whether the video card is securely fixed. You can remove it and try to clean the connectors using a regular office eraser. After this, you need to reinstall the video card and try to start the computer again. If your efforts do not bring a positive result, it would be better to turn to specialists for help. You may need to replace your 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 work on the motherboard yourself. The problem most likely lies in the hardware components, but first you can try resetting the BIOS. There are two options here.
- You can find instructions for the motherboard on the Internet and return to the original settings by connecting certain contacts.
— Remove the battery from the motherboard for 10 minutes, and then insert it back and restart the computer.
When performing these actions, you must remember safety precautions. The main thing is to do everything carefully so as not to damage the parts. Before you take any action, you must unplug your computer from the electrical outlet. In some cases, immediately after opening the cover 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 precisely for this reason. Even experienced users should not solder parts themselves. It is better to entrust the repair to the service center specialists.
Signal diagnostics
You can also fix the problem using a speaker. This is the name of a small device that connects to the motherboard. Using sound signals, the speaker warns about problems with the computer. The list of sound signals and their interpretations will differ depending on the computer model used. You can see the complete list in the instructions for the motherboard. To diagnose, we will need to check the BIOS version of the motherboard in the instructions and familiarize ourselves with the list of sound signals from the speaker. After this, you will need to disconnect all components from the motherboard except the processor, power supply and indicator button. Then you need to turn off the computer and listen to the speaker signals. To decipher sound signals, you must use a list. If the sound signal differs from those presented in the list, then the problem may be faulty RAM connectors. The reason may also lie in the system bus or memory controller. After this, you need to connect RAM to the board. The computer is turned on again and the speaker signals are checked. The speaker should signal that the video card is missing or not connected. If the speaker indicates a RAM-related problem, you will need to check it. After this, you need to check the connection of the video card. If the speaker emits a signal that there is no video card, you will need to check its connectors. They could be oxidized or shorted. You can also try cleaning the entrances 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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