Unplug every single thing from the pc, hard drives, cd-roms, pci cards, etc. Everything except for cpu, memory, powersupply, and video card. Boot it his way and see if you get a problem (i'm sure you still will since i cant see how it oculd be those other parts, but it's always the best way to start). Then one by one switch those parts out until it works, PSU first because I suspect it's either that or the motherboard. Good luck!
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