I left my computer on as I always do. After I came back from work, it restarted after I touched it. On post screen, no SATA drives were found. So, the boot manager came with an error "Please install boot disk". The motherboard is Foxconn AMD Nforce 590 SLI. Two SATA drives WD 750GB HDD and Samsung SATA DVDRW. So far I tried everything in the BIOS. Unplugged the drives, tried different SATA ports, removed and installed memory and video card, cleared CMOS. There is power to DVDRW drive as I can open the it and put a bootable XP CD. Nothing helped. All six sata connections come up on the first screen after restart and they all say no drive. Please, help.