No signal screen + cable not connected

Hello,

I have a problem with my computer. I turn it on, it beeps but the screen shows NO SIGNAL.
I tried with another screen, another VGA cable, and still nothing.

Yet every time I unplug the cable, the screen reacts and tells me "cable not connected."

I don't quite understand since my computer seems to work, and there were no issues yesterday.

Do you have any idea what might be causing the problem or any solutions? I’ve browsed other topics without really finding any solutions 0_o"

I have a Packard Bell iMedia and a screen of the same brand ;)

THANK YOU IN ADVANCE!