Innovative technologies are developing at an incredible rate today. But new developments also give rise to unfamiliar problems, usually associated with the settings of the equipment. Questions usually arise with beginners or those who, in principle, rarely use a computer. A common problem is the “No Signal” message on the monitor. To correct the situation, it is important to understand the reason. You can do this yourself.
General recommendations
Do not immediately look for the phone of a programmer or a wizard to fix computer equipment if the message No signal detected on the monitor appears. What to do in this case? The first thing to remember is all the last actions that were performed with the computer. Perhaps when cleaning someone accidentally hooked on the cable, the PC was disassembled or moved from its place. Children or curious pets can also cause breakdowns. Therefore, the first recommendation is to check all the wires. The problem will be solved very quickly when the cable falls into place.
It is also often recommended that you simply restart the computer. The PC may not start correctly, do not forget about sleep mode. More details about the latter case are given below. It is possible that a problem in which the computer monitor does not turn on can be fixed literally with the click of a button.
No malfunction
Messages may vary 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 this is the most common type of signature);
- cable disconnected and others.
Modern monitors have an automatic sleep function to save power. In this case, the signal may be lost, due to which these and similar inscriptions are displayed. If the computer still does not go into sleep mode, the solution should be sought elsewhere.
Also, any of these messages may appear when the computer is turned off and the monitor is working. As a rule, restarting the system helps.
Self-help troubleshooting
It often happens that the PC itself is in working condition, and there is no image, and the inscription No signal detected on the monitor is lit. What to do in this case, why the message appears, and what options exist to fix the problem? The reasons can be various: from the easiest and most easily remedied on your own to complex, when you can not 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 fine, but after a while “No signal” appears? Most likely, the PC just went into sleep mode, and to “wake it up”, you need to click the mouse or press the spacebar. Hibernation settings can be changed in the Control Panel (“Power” icon).
- If no reaction to the previous actions has occurred, you should try restarting the monitor mechanically - by pressing the “Restart” button or twice by “Shutting down”.
- In the event that the message still continues to be displayed, you need to restart the computer by long pressing on “On / Off” or using the emergency restart button on the system unit.
- If there is a message about the absence of a signal during the start of a game or program, as well as after the computer is idle, the problem may be that the monitor does not support the resolution of the screen saver 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 are located in the "Options" - "System" menu - the "Screen" and "Power and Hibernation" tabs. For Windows 7, the path is as follows: Start menu - “Control Panel” - “Power Management Schemes”. The changes must be saved, and then restart the computer again.
Other options
If the monitor writes No signal detected and does not show the loading of the operating system, it is necessary to check all screen connections to the system unit and video card. The plug may have lost contact with the connector. Then fixing the breakdown is not difficult: 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 we should further search for the reasons why No signal detected on the monitor is on. What to do and how to diagnose the cause yourself?
The troubleshooting algorithm is as follows:
- Connecting a failed monitor to another system unit or laptop. Did the image appear? This means that the screen is operational, and the causes of the message “No signal” should be sought deeper. If the picture is still missing, the monitor can be safely carried to a service center.
- When connected to another device, an image appears, but nothing works with the “native” system unit? Perhaps the problem arose 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 turning on the computer. If the monitor still shows No signal, you will have to open the system unit case.
- 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, check whether the video card is securely fastened. 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 the efforts did not bring a positive result, it is better to contact specialists. You may need to replace the motherboard, monitor, or video card.
For advanced users
The computer turns on, but shows No signal detected on the monitor? What to do if none of the previous methods helped? Those who are confident in their abilities and are not afraid to disassemble the very heart of a computer can do the motherboard on their own.
Most likely, the problem lies precisely in the hardware, but first you can try to reset the BIOS. There are two options:
- Find the instructions for the motherboard (or open it on the Internet from another device) and return the initial settings by connecting certain contacts.
- Remove the battery from the motherboard for 10 minutes, and then insert the part back and restart the computer.
When working, it is important to remember safety precautions, do everything carefully so as not to damage the parts, and before you take 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 malfunction may be in swollen capacitors. As a rule, in half the case the computer monitor does not turn on precisely for this reason. But even experienced users should not solder parts on their own. Entrust the repair better to the specialists of the service center.
Speaker Diagnostics
You can try to fix the breakdown using the speaker - this is a small device that is connected to the motherboard. The speaker warns about computer problems with beeps. The list of sound signals and their interpretations differs depending on the computer model: a complete list can be found in the instructions for the motherboard.
So, for diagnostics you will need:
- In the instructions, check the BIOS version of the motherboard, 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.
- After the computer should be turned off and listen to the speaker signals. Sound signals are decrypted according to the list.
- If the sound signal differs from the ones indicated in the list, faulty memory slots may become possible problems. 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 is 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 connectors on the card, they could short-circuit or oxidize. You can clean the inputs with an eraser. For traces of short circuit, contact a specialist. It is also necessary to check whether the elements of the video card are burned out: the radio elements, if desired, can be replaced independently, but if the microchip fails, you will have to buy a new video card.
- If the speaker signals problems with the south bridge, then the help of professionals is needed. This problem cannot be dealt with at home.
Any method of diagnosis requires attention and accuracy in the work. Do not neglect safety measures, and in case of serious or incomprehensible breakdowns, it is better not to repair the computer yourself, but to seek help from specialists.