WD Caviar 136AA 13gb on a Pentium III system w/AX6BC motherboard, Award BIOS 1998 PnP FAT32 one partition. Has been working fine, but now I get a "Disk Boot Failure, Insert System Disk & Press Enter". I can boot to a floppy, but can't access the hard drive. If I turn the computer off and on enough times, the hard drive will eventually boot and then run normally. Any suggestions? FYI, I've run a virus scan with the latest .dat's - no virus found.