I have a DFI P 965-S MB with a Intel 820 Pentum D CPU, Vista Home Premium, 3 G Ampo PC2-5300, 250 G WD SATA HD, and EVGA 8600 GT video card.System worked at start but I tried to update bios and nothing now. Changed bios chip twice. Purchase from DFI. Changed to Foxconn G41S-K still nothing tried all three sticks of Ampo ( Wintec ) memory and still nothing used PCI E video card on both MBs and the onboard on Foxconn. Could the problem be CPU.