There are several possible causes of “no signal” on a computer monitor, including: Loose or disconnected cables: A loose or disconnected cable between the monitor and computer can cause the ...

If there is No Signal on monitor on a new PC, but the CPU is running, you need to take the following steps to resolve the issue.

If your computer screen or external display goes black when HDMI is plugged in, check your HDMI setup. Use these fixes to resolve the issue.