What's going on with the computer keyboard light on but the screen black

time：2025-06-05 08:01:18 Tech Trends

What happens when the computer turns on with a black screen, but the keyboard light is on, and the monitor is black?

After powering on, the monitor displays a black screen, and the mouse and keyboard light are on, indicating that it has power supply, at this time, the following hardware reasons should be investigated to solve the problem:

1) Check whether the computer parts are firmly connected, first check whether the monitor cable is secure and reliably inserted into the host interface, and then check whether the contact between the graphics card and the motherboard I/O slot is good. If necessary, remove the graphics card and reinsert it again, making sure it's in place and in good contact.

2) Confirm whether the monitor is damaged, if the monitor and graphics card are firmly installed, replace a monitor that confirms normal, and give it a try. If the screen is no longer black, then the reason is that the monitor may be damaged.

3) Confirm if there is a problem with the fanIf the monitor is not damaged, further check if the CPU fan is running. If it is running, you can use a multimeter to measure whether the voltage output is normal to ±12V, ±15V, if it is not normal, you can change a power supply to try.

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