The monitor writes there is no signal and the computer works

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

On the display is the inscription “Check Video Cable” or “No Signal Detected”. If you press the Num Lock button on the keyboard, then its indicator will light up.

monitor, writes, there, signal

This shows that the system has launched, but there is no signal on the monitor and writes No Signal Detected.

  • Check the condition of the cable coming from the system unit to the screen:
      inspect the cable. If there is damage, then replace;
  • Disconnect and re.Connect;
  • Connect via an adapter/converter or via another connector;
  • Check the “legs” in the cable connectors;
  • Twist to the end the screws on the connectors;
  • Connect another cable.
  • Check the source of the video signal:
      go to the menu on the monitor panel (entrance or source);
  • Select the right port;
  • Check the settings of graphics (can be incompatible with the parameters set by the OS).

Subject check

First of all, it is worth starting with the simplest. No matter how absurd it looks, but sometimes everything is too obvious, and it does not occur to anyone. Therefore, if the computer does not see the monitor, then it is necessary to check if the cable has left and whether the device button is pressed. This should be indicated by a special light indicator.

If the monitor works properly (at least it is definitely connected) and there is no image on it, then you should try to press the menu button that opens the screen control panel.

Dust cleaning is required.

The computer turns on, but there is no image on the monitor in 90% of cases precisely because it urgently needs to clean the computer from dust. Also, at the same time, I advise you to change thermal grease and grease the fans, if necessary. The RAM is primarily ceased to work, and with it the whole PC. Sometimes a computer can even turn off or hang due to overheating, because dust clogs into a radiator and prevents the central processor from cooling normally. It naturally begins to overheat and as soon as the temperature reaches the maximum processor gives the command to immediately disconnect.

When cleaning the computer from dust, you should pull out all the PC components from your slots and blow them well. For this procedure, a span with compressed air is perfect. (you can buy in any computer store)

There is no signal on the monitor when you turn on the computer. Why and what to do?

Sometimes users are faced with a situation where, after the computer is turned on, the message “No signal” appears on the monitor.

Such a message on the monitor can be caused by various problems with the computer, so without proper experience it is unlikely to find the cause of the malfunction.

If you are faced with the same problem, we suggest you familiarize yourself with our list of the most likely reasons that can lead to this.

Problems with the connection of the monitor to the computer.

If when the computer is turned on on the monitor there is a message that there is no signal, then the first thing to 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 at the place of connection to the computer or monitor or the cable is not working and it needs to be changed.

First of all, you need to check the contact in the places of connection of the cable. To do this, turn off the cable from the monitor and the computer and connect it again. If it is a DVI or VGA cable, then be sure to twist two screws with which the cable is fixed in the connector.

Cabel fixation screw in the connector.

Cable breakdown, which previously worked normally, the phenomenon is quite rare. But, if you have another cable at hand, or you can remove such a cable from another computer, you can check how the monitor will work with another cable. It is possible to solve the problem after replacing the cable.

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The wrong signal source on the monitor was selected.

On the monitors that have several video inputs there is a button for switching between signals from these videos of inputs. As a rule, this button is called “Source” or “Input”. If the buttons are not signed on your monitor, then read the instructions.

Source button on a computer monitor.

Try to press this button several times to switch to another video input. If an incorrect video entrance was selected on the monitor, then this should solve the problem and the message “No signal” will disappear.

Video card malfunction.

If you checked all the above, but there is still no signal on the monitor, then this may mean a serious computer malfunction. The first suspect video card. If the video card is out of order, then when the computer is turned on on the monitor, the message “No signal” may appear.

You can check the video card for a fault in two ways: install a knowingly working video card on the computer or remove the video card and start a computer with integrated graphics (if any).

In the case of a video card breakdown, a situation is also possible when there is no signal on only one of the video card outputs. Therefore, it makes sense to try to connect the monitor to another video exit.

Video outputs VGA, HDMI and DVI on the video card.

For example, if DVI was used earlier for connection, then you can try to connect the monitor to the HDMI or VGA release of the video card.

Monitor breakdown. Is less commonly found in the video card, however, it can also lead to the appearance of the “no signal” message when the computer is turned on. Therefore, it is also impossible to exclude this option. Fortunately, in order to check this option you will not even need another monitor. All that is needed is any modern TV. Watch what video inputs (DVI, VGA, HDMI) your TV has and determine the easiest way to connect to your computer.

VGA and HDMI Video on TV.

Connect the TV to the computer and change the signal source using the Source button on the remote control. If the TV displays the 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.

Other options

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

The algorithm for eliminating problems is as follows:

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

The reasons why the monitor does not turn on when the computer is turned on

Some reasons are so simple that many, having read their description, will think that these lines were written by the teacher of the younger group of kindergarten for their wards, who for some reason do not turn on the monitor. But the order is the order, and we will follow it, from simple to complex, no matter how curious it may seem.

  • Reason the first. The monitor is simply turned off.
  • The second reason is the power cord.
  • The third reason is the cable between the monitor and the computer.
  • The reason is the fourth. Unknown, but similar to statics. Perhaps a portending campaign in the service center.
  • The reason is the fifth. Screw.
  • Reason sixth. Video card.
  • Reason the seventh. RAM.
  • Reason eight. Monitor power supply.
monitor, writes, there, signal

The remaining malfunctions, because of which the monitor may not be included when your computer is already in the competence of narrow specialists, and we will not talk about them.

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Next, we will consider ways to eliminate these reasons. In most cases, this can really help your monitor turn on again and shed light on the keyboard. Go!

The monitor does not turn on because it is turned off

No matter how ridiculous it sounds, the monitor does not turn on, because it is turned off. How such a seemingly natural fact was here, in the list of problems. There is a basis.

In some monitors, the inclusion button is located not on the front panel, but below, at the end. That is, she looks “on the floor”, and not at the viewer. And, often, the owners of computers themselves forget about its existence. Bought, turned on, and then the monitor stands in waiting mode, even for years, and it turns on itself as soon as it feels at the entrance a signal. This button can accidentally hurt, and then, of course, the monitor will turn off. Needless to say, the solution to such a “problem” is extremely simple: you need to find this button and press.

Found and pressed. Nothing changed. Move on.

monitor, writes, there, signal


Cord. Not the one on stage, but the one in the pilot. I mean, not. Which flies, and the one that lies on the floor, simply put, the cord, which is stuck into the extension cord. There is nothing complicated here too. The cord rarely falls out of the pilot Yes, never in general. Everything is fitted there according to European standards. But he can fall out of the monitor, where, of course, everything is also fitted according to European standards, but there is one nuance. This cord is often stuck into the monitor very tightly, so when assembling a computer it could be unhappy, and, as a result, it could take and fall out, for example, when moving the monitor.

The solution is extremely simple here: attaching a large enough, but reasonable effort, try to stick the cord deeper than it is, and if it suddenly advances (by a centimeter, approximately), then this is most likely solved the problem. The monitor will turn on immediately.

Tried. Did not help. Well, let’s go further.

Cable between the monitor and the computer

As in the second case, it is necessary to check if the cable connecting the monitor and the computer fell out. In this case, it may seem to us that the monitor has not turned on. But in fact, the monitor turned on, but does not receive a signal from the computer and simply shows us a black screen. So check the cable.

If it is HDMI (with two, similar to USB, but wider, connectors at the ends), then in the same way, you just need to stick these connectors, both on the system unit and on the monitor itself. If we are dealing with other types of connectors (either so wide and rectangular, with white plastic. DVI, or so wide and trapezoidal, with blue plastic. VGA), then you need to not only touch them, but also tighten the screws available on them, so that no one else could fall out of nowhere.

Non.Professional, collecting a computer, sometimes forget to pull them up (it works and okay!), but sooner or later this cable falls out. And then we sit and think why the monitor does not turn on. But here we twisted the screws. I hope the monitor has earned. Not? Move on.

Reason 4th. Mystical. Maybe there may be static.

Treatment: disconnect all cables from the monitor, and if there are sound cords, then they are also. And go drink tea. And let the monitor stand, disconnected from everything, and thinks about his behavior. Sometimes it helps.

By the way, the same method often acts on the system unit, if it suddenly stopped starting. Stands and is silent, like a fish in a pie. What is happening there. Unknown. Perhaps, a static electricity “flows” somewhere and blocks some starting process, and when we change the galvanic structure of the system, pulling out all the wires, this statics “drains” somewhere, and everything is corrected. Also, perhaps such a problem with the same repeating solution is a harbinger of visiting the service center. But let’s go further. Drank tea, checked did not help? The monitor does not turn on? Then we continue.

No signal in monitor || computer on but no display on screen || Cpu turn on no display

monitor, writes, there, signal

Video cards screw

Though above we called this reason so simply: “screw”, but in fact it is not as simple as the previous ones. Some economic and men’s skills will be required here, somehow: the ability to wield a screwdriver, fearlessness in front of electrical devices and accuracy.

So, turn off the computer, be sure to turn off the power supply, remove the side cover and strictly look around the video card. This item can be skipped if the video card is integrated, that is, it is not inserted into the computer with a separate block, but is located directly on the motherboard (or processor).

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Well, in other cases, you need, firstly, to make sure that it stands exactly in its slot. And if there is a suspicion that she was howling, then neatly, without excessive efforts, push her into place. If she moved and stood up smoothly, then it is necessary to tighten (and if it is not, then find and screw it up) a screw connecting the video card with the rear wall of the computer. Such a defect also comes from inattention or unprofessionalism of the one who installed this card. The screw there is not a hokhma for the sake of.

Okay. They twisted the video card. The monitor does not turn on again! Move on.

Evaluate the reliability of contacts

RAM, video card and other components are installed in slots on the motherboard. If they recently changed them, did cleaning or took them out of the nests for any other reason. There is a chance that the components were not inserted until the end. Due to poor contact, the image on the monitor may well be absent.

To check, turn off the power cable from the computer, carefully remove the side cover by turning the screws at the end panel end. Inspect the video card and RAM planks. Make sure they are inserted without distortions and until the end. Labs on the sides of the RAM should be closed, and the video adapter. Fixed with a screw to the chassis of the case.

There is no video signal on a computer monitor: the main causes of the malfunction

In most cases, problems with the absence of a monitor signal are associated with the operation of the computer itself. First of all, the problem is reported on the monitor screen, and then the processor goes into waiting mode. You can easily verify the serviceability of the display and its correct work by connecting the monitor to another computer or laptop.

Attention! Malfunctions of the monitor and the absence of a signal on it can be associated with an incorrect connection and disconnection of the cable, therefore, first of all, you need to check the connection of the wires.

Other reasons for the refusal of the screen and the fact that there is no detector on the computer, they are associated with:

  • Damaged power supply. The power of the computer can only be enough for the promotion of the cooler, so its sound is so clearly heard, and at other components, minimal power is directed, which does not allow the motherboard to turn on.
  • RAM does not work. Contact oxidation or simply their exit from the nest may occur, the result of these actions is the lack of a signal on PC.
  • Incorrect work of the video card. A graphic adapter can fail for any reason, from elementary overheating to voltage in contacts.
  • Refusal to work the motherboard. Such situations rarely occur, but if the problem of work is precisely in the “motherboard”, then the user will have to fork out for a new.

No need to run behind a new monitor, most likely, the cause of the breakdown is much easier to solve.

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

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

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

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

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

Pc is on but no monitor signal fix!

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

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