i have been having a problem with my pc for weeks, it has stumped the 2 shops i sent it to and has totally stumped me. i use my pc as a gaming platform, thats what its built for. im running a 2.2gig athalon 64. radeon 1900xtx, 2 serial ata and an asrock dual sata motherboard, but recently, for no apparantly reason my pc just shuts down on me, turns off, then restarts, blank screen, then comes on again. i need direction, could it be the power supply? the processor? is there any program that will tell me? please help, im at my wits end here