Why Does My Monitor Show No Signal?

A powered panel can still listen to the wrong source.

Open the monitor menu, select the physical input in use, and confirm both cable ends. A blank panel without its own menu points to a power or display issue.

Each active link can limit or break negotiation.

Remove optional switches and docks for a direct test. For USB-C, confirm the host port actually supports display output and the cable supports the required mode.

Controlled swaps identify the failing class.

Try one verified cable, another input, or the monitor with another source. Change only one part at a time and return settings before the next test.

No signal does not prove a dead GPU.

Use the computer maker’s display recovery guidance, check the correct graphics output, and seek service when known-good substitutions still produce no output.