The CMOS battery died on my kid's 486/DX. At about that time I (attempted) to install a sound card. I replaced the battery and reset the CMOS settings manually--the auto-detect feature would not work. After inputting the correct settings (Cyl 1050 Heads 16 Sectors 63), the CMOS puts the HD capacity as 565 (or something like that)--it should be 540MB.
The HD is a Connor CFS540A 540MB. Upon rebooting, it gives me a HD Failure error. I wonder if I messed up the cabling somehow. I've rechecked the power connection--the drive sounds like it's spinning. I've rechecked the ribbon cable. It appears to be connected to the board and the HD correctly (and thence to the CD ROM.)
Any ideas, anyone?