One day I left my computer running while having dinner came back and the thing was sitting there seemed like it died on me so I rebooted - got nothing... We ended up replacing the mobo but to no avail we replaced the PSU still to no avail... Then I switched out my XFX 6800GS (AGP) with an old Geforce 4200Ti we had lying around and lo-and-be-hold the computer boots and functions perfect... I'm not quite sure what is up with the XFX 6800GS card... So far from what I can determine the card is the problem but I dont know what is causing the card to act up.. I'd like your thoughs on this. My current specs are as follows: Asus P5VDC-MX mobo 2.8ghz Pentium D 1 GB RAM Geforce 4200Ti 250GB Harddrive 550 watt PSU Pioneer DVD-RW DVR-106D (DVD Burner) LITE-ON DVD SOHD-167T (DVD Reader) MSI 52X CD Reader