Computer screen shows no signal

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Reasons why the computer screen shows no signal: 1. Connection problem, make sure the connection cable between the computer and the monitor is inserted correctly and firmly; 2. Graphics card problem, you can try to re-insert and unplug the graphics card to ensure it is correctly connected to the motherboard, and you can also check the graphics card Driver; 3. Operating system problem, you can try to enter safe mode to determine whether it is an operating system problem; 4. Hardware failure, which may include a failure of the monitor itself, a failure of the computer motherboard, or a power supply problem. This topic also provides articles about other computer screen failures, which you can read for free.