Do the BIOS update just in case. Test the RAM with Windows memory Diagnostic. I still think that PSU could be the problem here, but the only way to know for sure is to replace it with another one and see what happens.
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AMD64 X2 3800+, Asus A8N-SLI Deluxe, 2 GB RAM, GeForce 6600GT, Windows XP Home SP2
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