I have been facing this problem since the very first day i made my computer.
I have a old CRT Monitor and a brand new CPU.
When i plug in the VGA cable and thighten the screws my mouse stops working even the light in the mouse turns off.
So i have to just push the VGA cable in the socket a bit(just that much that it gets the power and signal) and my mouse starts working and everything is fine.
Yesterday when i tried to switch on my system, my CPU turned on , the CPU light is on and fan is running, but the monitor is black.
if i unplug the VGA cable it turns on and i just see light blue light on the screen which i belive is due to no data being provided to the monitor.
I'm very much confused what is causing this and
frustrated because i have some urgent work to do but my monitor is black.