I built a new system using the Asus P4P 800 SE motherboard. The system has never been quite right. When I first builld it I had 2 gigs of non ECC ram in it and it was generating a lot of errors which destroyed the hard drive. I replaced the ram with 2 gigs of ECC and replaced the hard drive. Things where smooth for a while (one of those sticks of ram recently burned up and was replaced). Lately on boot up (this happens about once a week now) the system crashs when it gets into Windows. Looking at the event viewer I see either hard drive controller errors or atapi errors or paging errors. My fix has been to unplug the power supply from the motherboard then plug it back in. The system boots up fine for about another week then I get the above mentioned errors again. Sometimes on boot up I will get disk read errors, so when it eventually goes into windows I run scan disk and the hard drive comes up clean. I am afraid that if I keep going like this I am going to burn up another hard drive. I have the latest BIOS revision which hasn't really helped and may have made things worse, but does anyone have any idea what could cause this? Is it the motherbaord or is the power supply that is bad? Specs below. Asus P4P 800SE motherboard Kingston PC 3200 ECC RAM. WD 74 gig Raptor HD Plextor DVD burner Intel Prescott 3.2 gig processor Rosewill 580 Watt power supply HELP.