Analysis:

If the host indicator light is on or off and the screen does not display, there are two situations: no power (power indicator light is not on) or power on but no signal or display. "no sighal", the former means power failure or poor connection, while the latter usually means poor contact of the memory module or damaged graphics card.

Recommendations:

1. If the monitor is powered on but shows no signal, shut it down (if short pressing the power switch does not work, press and hold the switch until the power indicator light goes out or unplug the power cord directly ) Turn off the power and open the case, re-insert and unplug the memory module, wipe the gold finger with an eraser in one direction (you can also scrape the back of your thumbnail), install it and then turn it on again.

2. If the above operation is ineffective, shut down the computer, open the case, re-insert and unplug the graphics card, and tighten the data cable between the monitor and the graphics card. If it still doesn't work, consider the graphics card is damaged and replace it with a new one.

3. If the monitor does not have power (the indicator light does not light up), look at the back of the monitor, plug the power cord plug connected to the monitor upwards, and check whether there is power from the other end of the power cord to the socket.

4. If the host can be displayed when connected to other monitors or the local monitor still cannot be displayed when connected to other normal hosts, it means that the monitor is damaged and needs repair.