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 is not powered on; 2. The connection cable between the monitor and the host is faulty; 3. The memory module has poor contact; 4. The monitor is faulty; 5. The graphics card is faulty; 6. Motherboard failure. Detailed introduction: 1. The monitor is not powered on. This situation is very common. Many times it is because the monitor power cord is loose or not powered on. At this time, you only need to check whether the power cord is tightly plugged in or replace it with a new one; 2. The monitor and The host connection cable is faulty. Check whether the VGA cable or HDMI high-definition cable connecting the host and the monitor is tightly plugged in, etc.

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

1. The monitor is not powered on: This situation is very common and is often caused by the monitor power cord being loose or not receiving power. At this time, you only need to check whether the power cord is tightly plugged in, or replace it with a new one.

2. The connection cable between the monitor and the host is faulty: Check whether the VGA cable or HDMI high-definition cable connecting the host and the monitor is tightly plugged in. If it is loose, re-tighten it.

3. Poor contact of the memory module: Poor contact of the memory module is also a common problem. At this time, you can unplug the memory stick, wipe the gold finger with an eraser, and then plug it back in.

4. Monitor failure: If the computer can start normally after replacing a normal monitor, then it is likely that the original monitor is damaged.

5. Graphics card failure: If the graphics card fails, the screen will also display no signal. You can try replacing a graphics card to check if it is a graphics card problem.

6. Motherboard failure: If none of the above methods can solve the problem, it may be a motherboard failure. At this time, the computer needs to be sent to a professional computer repair company for inspection and repair.

When troubleshooting the above problems, you also need to pay attention to the following points:

1. Confirm whether the computer host emits a buzzing alarm. If so, you need to remove the memory module to see if it is burned. .

2. Check whether there is a burning smell on the back panel of the computer host, and check whether the interface has any traces of being burned.

3. When using the minimal system method, you need to unplug the data cables of the hard disk, floppy drive, and optical drive, and then check whether these devices are faulty one by one.

4. Before performing any hardware replacement or repair, be sure to turn off the power and disconnect the power cord to avoid any risk of electric shock or damage to the hardware.

The above are the possible reasons and solutions for why the monitor shows no signal after the computer is turned on. If none of the above methods solve the problem, it is recommended to contact a professional computer repairman or technical support team to help you solve the problem.

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