Why does the monitor show no signal after the computer is turned on?

The reasons why the monitor shows no signal after the computer is turned on: 1. The monitor signal cable is loose or damaged; 2. Graphics card failure; 3. BIOS setting problem; 4. Power supply problem; 5. Operating system problem. Detailed introduction: 1. The monitor signal cable is loose or damaged. Loose or damaged monitor signal cable is one of the common reasons why the computer startup screen displays no signal; 2. Graphics card failure may cause the computer startup screen to display no signal. If the computer's graphics card Failure or incompatibility will cause the signal to not be transmitted to the display properly, causing the display to malfunction and so on.

After the computer is turned on, the monitor shows no signal. There may be the following reasons:

1. The monitor signal cable is loose or damaged

Loose or damaged monitor signal cables are one of the common reasons why the computer startup screen displays no signal. If the monitor signal cable is not tightly connected or damaged, the monitor will not be able to receive the signal from the computer, causing the monitor to be unable to display properly. At this time, you can check whether the monitor signal cable is tightly connected and whether the signal cable is damaged. If there is a problem, you can try to replace it with a new one.

2. Graphics card failure

Graphics card failure may also cause the computer startup screen to display no signal. If the computer's graphics card is faulty or incompatible, the signal will not be transmitted to the monitor normally, causing the monitor to be unable to display properly. At this time, you can check whether the computer's graphics card is faulty, and you can try to replace the graphics card or upgrade the graphics card driver.

3. BIOS setting problems

BIOS setting problems may also cause the computer startup screen to display no signal. If the computer's BIOS settings are incorrect or modified, the monitor may not display properly. At this time, you can check whether the computer's BIOS settings are normal and restore or adjust them as needed.

4. Power supply problem

Power supply problem may also cause the computer startup screen to display no signal. If the computer's power supply is insufficient or the power supply fails, the computer may not be able to start or output signals normally. At this time, you can check whether the computer's power supply is normal and replace the power supply if necessary.

5. Operating system problems

Operating system problems may also cause the computer startup screen to display no signal. If there is an abnormality in the computer's operating system, it may cause the computer to fail to start normally or to output signals normally. At this point, you can try to enter safe mode or reinstall the operating system to repair it. In addition, some viruses or malware may also cause system problems, and antivirus or malware cleaning can be performed.

In addition to the above reasons, there are some other problems that may cause the monitor to display no signal after the computer is turned on, such as:

Memory module problem: loose or damaged memory module will also cause the computer to be unable to start. Or it cannot be displayed normally. At this point, you can try to pull out the memory stick, wipe the gold finger with an eraser, and then reinstall it. If the problem persists, you may need to replace the memory module with a new one.

Motherboard problem: A motherboard failure may cause the computer to fail to start or display properly. At this time, you can contact professional computer maintenance personnel for inspection and repair.

Other hardware problems: In addition to the above problems, there are some other hardware problems that may also cause the monitor to display no signal after the computer is turned on, such as keyboard, mouse, hard disk and other hardware failures. At this time, you need to check whether the hardware is working properly one by one.

In short, there are many reasons why the monitor shows no signal after the computer is turned on, which needs to be analyzed and investigated according to the specific situation. If you are not sure how to solve the problem, it is recommended to contact a professional computer repairman or technical support team for troubleshooting and repair.

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