I have core i3 first gen with Asus p7H55-V , 4 gig ram and 1gb Ati Raedon Hd 5750. The display goes off after some time and even on clicking mouse or pressing any key doesnt come back, it occurs often now ...and i have to restart my computer every time this happens. any suggestions plz .... it also gave a blue screen error recently but i have'nt installed or uniinstalled any hardware.