Why is the screen black when the computer starts up?

It is relatively easy for the computer to turn on a black screen, especially in some older computers or pre-assembled computers.

There are many causes of computer black screen, such as damaged monitor, damaged motherboard, damaged graphics card, poor contact of graphics card, damaged power supply, damaged CPU, excessive temperature of components, etc. There are also cases where the computer black screen is artificially caused, such as Microsoft China's genuine verification.

There are generally four situations when computer black screen failure occurs:

1. Totally black: Neither the host nor the monitor (including the indicator light) lights up.

2. Indicator light: The indicator light of the monitor is on, but the indicator light of the host is off.

3. The monitor does not display: The indicator lights of the monitor and the host are both on and the cooling fan of the switching power supply rotates normally, but the monitor does not display.

4. Dynamic black screen: Dynamic black screen, displayed when booting, but not displayed after a while.

It is impossible to accurately determine the cause of the problem based on the subject's description. It is recommended that when the screen is black, the subject first checks whether the host starts up normally, whether the video signal cable is detached, whether the monitor indicator light has a signal, whether the computer's memory module is loose or the gold finger of the memory module is oxidized, etc.