Monitor

Something fucked up is going on with my PC. The monitor randomly goes into power saving mode and the computer freezes almost instantly after that. Everything is connected correctly and I think I have no power issues. I have noticed that anytime I bump into my desk or cause some vibrations on the desk this happens. Alos while playing games or HD videos.

Anyone can point me as to what my problem may be?

>>2
But I've never dared to mess with the insides of my PC, save putting an HDD once. I dunno which shit is which.