I'm looking at a two yr old AMD K6-2/500 with SIS 530 chipset, running Win ME. On boot up, the HD is not found, yet the CDROM is. They are both on the Primary IDE. Same results on the Secondary IDE. I've reseated the RAM, reseated the CMOS battery (which tested OK), tried KNOWN good HD's in it, reset the BIOS to defaults, and tried booting without the CDROM connected. All results are the same. I can boot using a boot disk, and again the HD is not found. FDISK does not see it either. Inside the BIOS, the AUTO DETECT cannot find it either. Right now, I am thinking mobo replacement, but would welcome any further suggestions before I do that. By the way, the HD does boot up my other machine. This trouble happened all of a sudden. Thanks in advance for any help.