Benq monitor no signal detected what to do. What to do if there is no signal on the monitor when you turn on the computer
Every user will face this problem sooner or later. No matter how much I would like this.
When you, instead of the usual process Windows boot, you see the message No signal detected on the monitor when you turn it on, although the system unit is noisy, the coolers are spinning, you might think that the computer has turned on, but the monitor does not show an image, but this is not the case. The computer does not turn on, and only the coolers are spinning. You can verify this by looking at the indicators on the system unit. Usually there are 2 indicators on the system unit, one displays power, and the other indicates processor activity. That is, if the computer was working, the second indicator would blink randomly.
What does no signal detected mean?
Translated into Russian, the phrase sounds like “No signal.” In simple words In other words, the video card does not transmit the video signal to the monitor and therefore the monitor goes into sleep mode.
It may seem that the video card is to blame for this, but this is not always the case. Most often the culprit may be RAM or motherboard.
How to fix no signal detected on monitor
Where you should start is by checking the cable that comes from system unit to the monitor. Check if the cable is well secured, pull it out and insert it again and fix it well, perhaps the cable has just come off a little. The cable in the connector should fit tightly and not dangle. If you have a built-in discrete video card, then the monitor must be connected to an external video card, which is located below the built-in video card.
External video card 
VGA connector of the built-in video card The cable is well secured and we try to turn it on. If everything is the same, there is no signal, then we move on.
The culprit may also be RAM. We pull out all the RAM strips from motherboard and wipe the contacts with an eraser.
Once we have wiped the contacts on both sides, we insert one strip at a time and try to turn on the computer each time.
The same can be done with an external video card. We take it out and rub the contacts with an eraser. If the motherboard has a connector for connecting a monitor, then you should try connecting the monitor to it, but before turning on the computer, you should remove the external video card.
It would be a good idea to reset the BIOS settings. This requires 5 minutes. After that, insert the battery into place and try to turn on the computer.
Check the power connectors on the motherboard, pull them out, see if there are signs of burning or darkening, and put them back in place.
Another option is to disconnect everything from the motherboard. Hard disks, drive, network cards if available, keyboard, mouse and other peripherals that were connected. Connect only the monitor to the built-in video card and try to turn it on. If the motherboard is alive, then sound signals should follow, by which we determine what is swearing.
If after all the above steps the problem is not solved, then most likely the motherboard is faulty and nothing can be done except take it to a service center, but repairing the motherboard will cost you the same as buying a modern motherboard.
Sometimes users are faced with a situation where, after turning on the computer, a “no signal” message appears on the monitor. This message on the monitor may be caused by different problems with a computer, so without proper experience it is unlikely that you will be able to quickly find the cause of the malfunction.
If you are faced with the same problem, then we suggest you familiarize yourself with our list of the most probable causes which may lead to this.
Problems connecting the monitor to the computer.
If, when you turn on the computer, a message appears on the monitor stating that there is no signal, then the first thing you should check is the cable that is used to connect the monitor to the computer. There are usually two problems with the cable: the cable may lose contact where it connects to the computer or monitor, or the cable may be faulty and need to be replaced.
First of all, you need to check the contact at the cable connection points. To do this, disconnect the cable from the monitor and computer and reconnect it. If this or VGA cable, then be sure to tighten the two screws that secure the cable in the connector.
Screw for fixing the cable in the connector.
Breakage of a cable that previously worked normally is quite rare. But, if you have another cable on hand, or you can remove such a cable from another computer, then you can check how the monitor will work with another cable. Perhaps after replacing the cable the problem will be solved.
The wrong source is selected on the monitor.
On those that have multiple video inputs, there is a button to switch between the signals from these video inputs. Usually, this button called "Source" or "Input". If the buttons on your monitor are not labeled, then read the instructions.
Source button on a computer monitor.
Try pressing this button several times to switch to another video input. If the wrong video input was selected on the monitor, this should solve the problem and the “No Signal” message will disappear.
Video card malfunction.
If you have checked everything described above, but there is still no signal on the monitor, this may indicate a serious computer problem. The first suspect is the video card. If the video card is faulty, then when you turn on the computer, the message “No signal” may appear on the monitor.
There are two ways to check a video card for malfunction: install a known working video card into the computer, or remove the video card and start the computer with integrated graphics (if it has one).
In the event of a video card failure, it is also possible that there is no signal at only one of the video outputs of the video card. Therefore, it makes sense to try connecting the monitor to a different video output.
Video outputs VGA, HDMI and DVI on the video card.
For example, if you previously used DVI for connection, then you can try connecting the monitor to the VGA output of the video card.
Monitor malfunction.
Monitor failure is less common than video card failure, but it can also lead to the “No Signal” message appearing when you turn on the computer. Therefore, this option cannot be ruled out either. Fortunately, in order to check this option you don't even need another monitor. All you need is anyone modern TV. Look at what video inputs (DVI, VGA, HDMI) your TV has and determine the easiest way to connect to your computer.
Video inputs VGA and HDMI on TV.
And change the signal source using the "Source" button on the remote control. If the TV displays a picture from the computer, then the problem is either in the monitor or in the cable that was used to connect the monitor to the computer.
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 find the phone number of a repairman. computer equipment. What can be done in this case? First of all, you need to remember what latest actions were performed with a 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 similar problem 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 in modern monitors An automatic sleep mode function is provided. 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 turns out that Personal Computer 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 fix the problem, you can try next 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 when performing previous action If there is no reaction, 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 button emergency reboot 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 compatibility computer games and programs with computer capabilities. 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 operating room Windows systems 7 you must use the following path: “Start” menu - “Control Panel” - “Power plans”. 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 still fail 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 the problem needs to be looked deeper. If the picture does not appear, then you can safely take the monitor to 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 do it yourself motherboard. 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 them initial 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 You should not solder the parts yourself. It is better to entrust the repair to the service center specialists.
Signal diagnostics
You can also fix the problem using a speaker. So called small device, which 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. In the instructions for the motherboard you can see full list. To diagnose, we will need to check the instructions BIOS version motherboard and familiarize yourself 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 sound signal differs from those presented in the list, then the problem may lie in faulty RAM connectors. Also, the reason may lie in 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.
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. Good side discrete card is that it can be easily updated/replaced.
So now the second thing you need to check to troubleshoot your computer is graphics card. The reason we're testing the card now is because it handles all graphics process and displays graphic images computer user.
In case you don't have installed video card on your computer, you can skip this step because your computer's graphics process 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.
A lot can happen various errors GPU: 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 cables peripheral device, and then place the computer case on the table and begin to unscrew the side cover screws.
After this, you will need to remove the card from your PC case, which is mainly installed in PCI slot x16 and is held holder PCI cards .
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 proper physical connection between motherboard for correct operation. 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 this, 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 are many things in your computer case additional equipment, which have nothing to do with running your motherboard. So it's time to remove all these additional components and start 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 she can save current setting date or time, download 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, replace battery motherboard CMOS 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 cannot test core 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
Hi all! Probably many of you have encountered a situation where there is no signal on the monitor when you turn on the computer. Any PC user can encounter this problem. But what could be the reason that the display remains dark when the system unit starts? What to do in such cases? We'll figure out.
If, when you turn on your computer, it boots, makes normal sounds, a flashing red light on the front panel indicates ongoing processes, but there is no image, operating system The computer will boot and work normally, but you won’t be able to see it, just as you won’t be able to use it. There are actually quite a lot of possible reasons. Here are the main ones:
- malfunction of the monitor itself;
- there is no contact in the connecting connector of the video card with the monitor cable;
- BIOS crashed;
- problems with the RAM board;
- the video card is faulty;
- motherboard is faulty;
- The computer's power supply is faulty.
Let's look at how you can correct the situation or identify a breakdown in each case at home.
Attention! All of the following actions should only be performed if the system unit is disconnected from the power supply!
Monitor is faulty
Unscrew the screws of the monitor plug from the connector that supplies the signal from the video card of the system unit, and remove it. If the message “No signal” lights up on the screen (it may be in English), then everything is fine with the monitor. If it had burned down, it would not even show this inscription.
If you have the opportunity, try it. The easiest way to do this is with using HDMI cable.
Problem with contacts in connector
The steps are the same as in the first case. The connector going from the video card to the monitor can be (in most cases) of three types: VGA ( of blue color), DVI (white-gray or black) and HDMI (Black). You can read more about the connectors and other characteristics of the monitor.
Unscrew the screws of the connector, remove the plug, insert it back and tighten it again. Turn on your computer. If it doesn't work, move on. Try inserting the cable into a different connector or use an adapter. Perhaps a simple cable replacement will help, i.e. If possible, be sure to try a different cord.
Perhaps we just encountered a loose connector, so press the plug and see if there is a result.
BIOS problem
Otherwise software for the motherboard it is called BIOS. If you have problems with it, you can easily return it to 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 is already for a long time has not changed (4 or more years), you can completely replace it with a new one. If the computer was purchased relatively recently, simply release the contact and remove the coin cell battery from the connector.
To reset the settings, you can short-circuit the contacts with a screwdriver (+ to –) or wait ten minutes. Then put the battery back in and start the computer. If the image appears, the problem is resolved. If there is still no signal to the monitor, then move on.
RAM problem
Slots (connectors, in Russian speaking) of RAM modules (boards) are located, as a rule, to the right of the processor (a massive square with a radiator and fan). In any case, they cannot be confused with any other boards. This could be one module for several gigabytes, or maybe several 1 or 2 gigabytes each.
Press the clasps on both sides of the board to pull it out of the connector. Clean the contacts thoroughly. For this regular one will do student eraser (eraser). Insert the module into place. Start the car. If the image appears, the problem has been resolved. If not, it would be good to try replacing the RAM board 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's easier when there are several boards. After removing and cleaning everything one by one, do not put everything back in place at once. Identify the non-working board using the method of elimination. Insert three, and then, one by one, change the boards. We inserted three and turned on the computer. The display is not working. Turned off the computer. They took one out, replaced it with another, and turned it on again. If during these operations the display begins to show loading, the board that remains unconnected is the non-working one. It should be replaced with a new one.
In the end, try using a different slot if the characteristics allow, since this can often be the problem.
If everything remains unchanged and the display remains dark when you turn on the computer, move on.
Video card malfunction
If the motherboard has a built-in video module, then you have a direct route to the service center. You won't be able to check it. If it is separate, you can replace it with another one. It happens that the built-in video module is low-power, and people purchase 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 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 release the clamp (plastic lock) from right side(sometimes it may not exist).
Then connect the connector from the cable going to the monitor to the output of the built-in video card, which is usually located higher. It is the same color and the same shape. Start your computer. If the image appeared, the problem was with the removed video card.
Attention! If you don't pull it out additional video card from the slot, but simply switching 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 the fault by replacing it with another one. Just as in the case of an integrated 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 was there before. If the image goes well, yours is more powerful card“covered up.” If the display continues to remain silent, then the problem is more global.
Conclusion
A faulty motherboard or power supply can only be identified by taking the equipment to a service center. Of course, it won’t be difficult for “specialists” to get a power supply from the outside and try it by reconnecting all the connectors. But it is better to entrust these procedures to real masters. But just never contact ad masters! This is so crazy. They will rip you off at exorbitant prices, and the repairs will be questionable.
Well, this is where I end my article. I hope that it was useful to you and that the information provided in it helped you cope with the problem. Don't forget to subscribe to my blog and also to my social media. Good luck to you. Bye bye!
Best regards, Dmitry Kostin.
