Problem....

Ok so I built my computer and its components are
EVGA 680i SLI motherboard
E6600 core2 duo
8800GTS 640 gpu
GSKILL 2GB ram

So i had an error occur a while ago where i couldnt start my computer up at all. after trying to start up it would say. "HARD DISK DRIVE FAILURE, PLEASE ENTER SYSTEM RESTORE DISK AND HIT ENTER" so i did just that but i would just pop up again, so i figured since my cd drives and my hard drive arent working, it had to be something else. So I RMA'd my mobo, my computer worked fine for another 3 monthes, then the same error just occured. Could this be just chance that the same error occured. is this even a motherboard problem or could it be caused by a faulty PSU or ram becoming bad and wearing down my mother board?

Maybe you updated bios & clear cmos? Don't jump on evga bioses. Wait for 1-2 months at least. FWIW, the XFX 680i bios works BETTER than EVGA's on EVGA 680i board. There's a rather long thread about it at evga.

http://www.evga.com/community/mess [...] aultmb.asp

Check the boot order in bios.

What's your psu?