What to do if the monitor writes no signal

When starting a computer, the monitor does not turn on. How to return an electronic friend to life

Frequent user question: what to do if the monitor writes “no signal”, and the computer works, and also what the messages mean: No Signal Detected, Check Signal Cable, No Input Signal, “Check Sign. Kab.”,” The signal is not detected “and similar. The problem can occur with any type of connection: HDMI, VGA, Display Port and DVI. This instructions in detail about why there is no signal or “No Signal Detected” when turning on the computer on the monitor, possible causes of the problem and ways to correct the situation. At first. Simple options, then more complex, but also in many cases triggering. A similar problem: the monitor writes outside the range, the entrance is not supported (or out of range and input not supported).

  • What does Check Signal Cable, No Signal Detected mean on a monitor
  • Simple ways to fix “no signal”
  • Additional reasons and decisions
  • Video instruction
monitor, writes, signal

What does Check Signal Cable, No Signal Detected mean and there is no signal on the monitor

All of the listed messages on the monitor screen have one value: a video signal supported by this entrance does not receive the input. There is one reason, but messages depending on a specific monitor can be different.

  • Checksignalcable means “check the signal cable” (the one that is connected to the monitor to the computer). Can also be displayed as “check the SIGN. Kab.””.
  • Nosignaldetcheded means “NOT DISCIVE”.
  • Noinputsignal says it translates as “no input signal”.

Connection check

If the monitor writes “There is no signal”, first of all, the PC connection is being checked:

  • Does the plug fit tightly? With low.Quality consolidation of the plug in the connector, there is a lack of contact with the monitor. If the display is connected through the analog entrance and the plug adjaches not tight enough, the image can and will be on the screen, but with stripes and interference. To check whether the cable is connected correctly, it is necessary to disconnect it and reinforce it. After the work, the screws fixing the cable in the connector are twisted.
  • Is it a cable? To check the wire for a breakdown, another (working) cable is used, which must be inserted and convinced of its performance. If the image is resumed, then the original cable is damaged and needs to be replaced.

There is no image on the monitor

If any information (black screen) is not displayed on the display, first check the operability of the monitor, the following actions will depend on this. To check, connect the display to another computer or laptop.

If the monitor is faulty

If the image is completely absent, then a matrix or a nutrition microcircuit on the monitor has come out of order. In this case, you will have to contact the service center for further diagnosis and identify faults. Most often in a situation where the monitor does not respond to connection, you will have to think about buying a new.

If, when connecting the display to the computer, the user observes a dull blurry image, then LED backing or circuit of power is faulty. When burning capacitors on a board or injector, a high.Voltage voltage ceases to form. In this case, LED backlighting will not work properly. If the user does not have sufficient knowledge for the diagnosis and repair of the monitor, the best solution will be to contact the service center.

Carefully! There are capacitors that save a voltage of 1000V even after the power cable is disconnected on the power supply control board.


If the computer is faulty

The lack of an image on the monitor may indicate problems with BIOS. To eliminate a malfunction, try to drop the BIOS to factory settings. Follow these actions:

  • Turn off the computer power cable from the mains and remove the side panel.
  • Report the CLRTC jumper located on the motherboard from position 1-2 to position 2-3.
  • After 15-20 seconds, rearrange the jumper to the standard position.
  • Install the side panel in place and connect the power cord.
  • Check the image on the monitor.
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Sometimes the absence of an image is associated with poor contact of RAM. To check if this is so, follow the following actions.

  • Disconnect the power cable from the system unit and power grid.
  • Unscrew the fasteners and remove the side panel of the computer.
  • Using a soft brush, blow the computer from dust (it is best to do this on the street).
  • Put off the latches holding the RAM and take it out of the connector.
  • Using the eraser, clean the contacts on the bar.
  • Do the same for all RAM boards.

If none of the above helps, then the malfunction is much more serious, and may be associated with the breakdown of the North or South bridge on the motherboard. In the service center, specialists will be able to more accurately determine the cause of the problem. If the repair is inappropriate, you will have to replace the motherboard with a new.

Problems with the connection to the system unit

Another common reason why there is no signal on the monitor when the computer is turned on is the absence of a signal between the system and the monitor due to damage to the cable connecting them, the monitor or nest on the block. In this case, light indicators on the monitor will burn when connected to the network by launching the monitor, you will see the logo of its manufacturer, and in certain cases there is also a message about the absence of connection or transition to the energy.Saving regime. In general, you will definitely see something on it, but it will not respond to the inclusion of the system.

It is worth starting the search for malfunctions again with the cleaning and reconnecting of the cable; When connecting, be sure to make sure that it was installed tightly and tighten the screws on the sides of it (if they are there). If shortly before that you were reconnecting the monitor, you can try to consider the cable at the joints with the monitor and the block. Inside you will see many small rods, if one of them is bent or broken, then this is the reason for the breakdown.

monitor, writes, signal

If there is no result, then the next thing you need to try to do is connect another wire to your PC. You can remove it from another computer (if you have one) or take it from someone. If the monitor has earned with the new wire, then the reason is clearly in it. But if not, then there are two options: either the reason is something else, or you need to carry the block to the master (you yourself do not fix the nests).

Why there is no signal on the monitor when you turn on the computer

So, there is no signal on the monitor when you turn on the computer. What to do? If there is a message about the absence of a signal on the monitor, first check the cable connecting the monitor to the system unit. Two problems may take place here: loss of contact in the cable or a complete malfunction of the cable, which will require its replacement.

Компьютер не видит Монитор Монитор пишет No signal detected No input signal/Check signal cable

So, check if the contact ability in the cable is violated. Disconnect the cable from both the system unit and from the monitor, and re.Connect it. Be sure to tighten the screws fixing the cable in the connector. Also check the cable for the breakdown. This rarely happens, but this can happen. You can carry out a check with another wire with you. Insert it and make sure if the monitor is now working properly. If so, then it is clear that your wire is faulty and it should be replaced.

The wrong signal source was selected

If there is no signal when the computer is turned on, the monitor is black and there is no more reaction, check if the entrance is selected correctly. Some monitors are with several inputs. At the same time, there is a special button that allows you to switch from one entrance to another. It is usually called “Input” or “Source”. They did not find a button? In this case, the instructions for the monitor will help.

You need to press the button for switching from one entrance to the other several times. If the entrance is incorrectly selected, then with the help of the button the problem may well be solved.

The above did not help, and the inscription about the absence of a signal is still shown on the monitor? The problem was more serious. Among the suspects in the first place you can put a video card. The appearance of the inscription described by us may be from the failure of the video card.

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So, check the video card for a malfunction. Look at the link all ways to check the performance of the video card. Within the framework of this article, we dwell on two main methods: installing another working video card in the PC or removing the video card and launching PC with integrated graphics in case of it.

Also, when changing the video card, there may be such a situation that the signal is absent only when using one card output. Here try to connect the monitor to another exit. For example, previously connected to DVI, now try VGA or HDMI.

If until now, when a computer is turned on, the monitor writes “no signal”, then check the monitor itself for breakdown. This is less common than a video card malfunction, but also contributes to the emergence of a message such as there is no signal when PC is turned on. Therefore, it is possible that the source of the problem lies here.

In this case, of course, it will be necessary to connect another monitor to the PC, already knowingly worker, and check if it works. But there is a check option and the method of connecting to the TV. Check out the videos presented on the TV and select the most optimal way to connect.

Connect TV to PC and change the signal source with a button called “Source”. If the image in TV earned, then we can conclude that the problem is concluded in your monitor or in the cable of its connection.

If you still need to find out why there is no signal on the monitor when you turn on the computer, that is, another difficult way. The speaker is a small size of a peculiar squeak in the form of a speaker connected to the motherboard. It is required to check the components of the system unit. This speaker is on the standard. If you changed something in BIOS, and somehow it turned out to be turned off, then it is worth climbing in the BIOS settings to turn it on.

What is the point? All maternal boards of our time are equipped with a built.In warning system. Before you load the system, it checks for a malfunction of all components of the PC connected to the motherboard. Found a malfunction. You will hear a sound in the form of a sound. Various types of malfunctions differ in the number of signals.

Find out your BIOS version and a list of faults, and you can start finding a problem.

So, for the output of the malfunction, we follow the following steps:

  • Disconnect all components from the motherboard. Do not disconnect only the processor, indicator buttons and a nutrient unit. Turn on PC. The speaker should give a sound warning about the absence of RAM. Compare it with a standard list. There is a difference? So, malfunctions in the validity connectors for RAM. There may also be a tire malfunction or controller. If everything is fine, then we follow.
  • Connect the RAM and turn on PC. The speaker must impregnate a signal about the absence of a video card. If he gave a signal about malfunctions with RAM, then conduct its diagnosis. So the occurrence of the malfunctions of her planks, the marriage of the controller or breakdown of the slots are so possible. Replace the motherboard. In the absence of signals about problems, follow further.
  • Connect the video card. Turn on PC. If the signals are heard about the absence of a card, then check its slot for the presence of the consequences of oxidation or short circuit. If there are shortings, then the connector is faulty, and when oxidation, just clean it. Also check the contacts for oxidation. Clean them carefully with the usual clerical eraser without damaging the coating. Check the components of the card, are they burned out. If just a radio element is damaged, this is not scary, but in the case of failure of the microchip, change the card.

If the speaker signals the problem with the “South Bridge”, then contact the service.

If the above information did not help you understand why there is no signal on the monitor when you turn on the computer, then we recommend contacting specialists. But in general, the main possible reasons for this problem are described here. So try, analyze and diagnose the problem, and you will find its source if you try hard. If no longer, it is quite possible that you have to replace something from the components of your computer or give it to the repair.

Reset the monitor settings

In some cases, the problem under consideration occurs after the user has set up brightness, contrast or other parameters. New settings can come into conflict with some kind of computer parameters or even with themselves, so it will be very useful to reset the settings.

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On different models of monitors, this operation is performed in different ways. Here are several ways:

One.The monitor itself can have a button with the name Reset or like that. And there may also be a set menu item with the same name. In any case, look at the instructions for your monitor if there is such an opportunity.

  • Press the right mouse button anywhere in the screen;
  • Choose the “screen resolution” item or something similar in the drop-down menu;
  • In the window that opens, select the “additional parameters” item;
  • Go to the Monitor tab;
  • Set the frequency of 60 Hz (this is the standard parameter, most likely, it was he who has lost).
  • In the same window, press the “Properties” button;
  • Go to the Driver tab;
  • Click the “update” button (perhaps this option will help);
  • Follow the instructions of the system.

Hint: To boot in a safe mode, when loading, press the F8 button until the system load options appear. Among them there will be the option we need. You need to choose a “safe mode” using a shooter and press the Enter button on it.

These are all methods that allow you to reset or update the monitor settings. If this does not help, we proceed to the next method.

What should be done from the very beginning

As we said above, in most cases you can do with “low blood”, that is, use simple methods for solving the problem. In most cases, users do not even pay attention to the things that we will talk about further, but the reason for the lack of a signal on the monitor lies in them. So, if the monitor does not work when you turn on the computer, do this:

Check the fit of the connected cable to the connector. Than the banal reason for the lack of a signal on the monitor when the computer is turned on may cover that the cable is not connected and simply does not have the ability to transmit the signal to the connector.

monitor, writes, signal

So try to put pressure on the plug itself. VGA and DVI cables are used to connect monitors. They have special fixation screws. Twist them all the way.

Tip: the same thing should be done with the power cable. Although it usually adjacent to his connector, in some cases it still leaves.

Some monitors have a signal source switch button. In most cases, it is called source. This inscription can be found on top of the buttons or on it yourself. In any case, try to press it several times. It is possible that the wrong signal source was chosen.

Connect the monitor via another cord or in another connector. Monitors can be connected not only using VGA and DVI, but also through HDMI. At first you can simply connect an existing cable to another connector.

For example, initially it can be connected to the motherboard, but the video card has the same connector (all this is behind the system unit), so it is worth connecting it there or vice versa. If there are appropriate connectors on the monitor, try to take another cable that was originally connected via VGA, but it has a DVI connector, so you should take such a cable and connect the monitor.

Hint: Experiment! In some cases, the connection of both cables helps or only one (if earlier the monitor was connected through two cables). In general, try all available options.

Now let’s move on to more complex methods of solving a problem with the absence of a signal on the monitor.

The malfunction of the motherboard or power supply can only be identified by handing over the equipment to the Center service. Of course, the “specialists” will not be difficult to get a power supply on the side and try it, recovering all the connectors. But it is better to entrust these procedures to real masters. But just never contact the ads for ads! This is such a game. Will fade you exorbitantly, and the repair will be doubtful.

Well, on this I finish my article. I hope that it was useful for you and the information presented in it helped you cope with the problem. Do not forget to subscribe to my blog, as well as my social networks. Good luck to you. Bye Bye!

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