It could be the fan going bad on the graphics card - overheating and crashing.
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Intel Prescott 3.0 Socket 478
Seagate 250GB 16MB Cache
160GB Seagate in Vantec NexStar 3 Enclosure
ASUS P4P800-E Deluxe
LG DVD-ROM
NEC DVD-RW DL
1GB Corsair PC3200
GeForce 5700 256MB DDR |