Display reads no signal even though its connected

[Dk135]

The desktop reads no signal even though its connected and the desktop has power the cable and monitor works on my girlfriend’s pc but not mine.

[TheOldMan]

What typically happens under that scenario the monitor is not connected to the proper out/input either on the computer or monitor.  Many choices on a desktop and not so many on a laptop but they have to match.

So, to start with - indicate what works on the girlfriend's PC and what make and model of the PC and what are the connection types being used.

Then on the desktop - make and model.  Assuming you are using the same type connections as on the girlfriend's PC?

My educated guess until I know more - the desktop's connections are not active, either because of a graphics card or whatever.  Indicate the connections being attempted and make and model of the desktop.