Prebuilts are not known for their good power supplies, and it is also another good possiblity that it's not sufficient enough for the system. You'd probably have to hope for the best and hope that it isn't the motherboard.
Try another PSU from another computer [if possible].
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Core 2 Duo E2140 1.6GHz @ 3.04GHz
GA-P31-DS3L
pqi Turbo CL4 DDR2-800 2GB
Sapphire HD3850 256MB
Sony Writemaster DVD Burner EIDE
Seagate Barracuda 80GB 7200.9 8MB SATII
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