I have a Dell Dimension 8200 that I use as a backup system and server, with 2 hard drives plus some USB external drives. The system suddenly stopped seeing the 2 internal hard drives, after my W.D. MyBook USB external drive died. Neither the system nor the BIOS sees ANY hard drives, nor does any rescue software I have (Acronis and others) or Linux. Both drives test good in other systems. So far I have replaced the CMOS battery, and re-set the BIOS and re-flashed the BIOS (twice) to no avail.
Is it possible I need to take further steps to ERASE the CMOS? When I try to boot I get the beep and "hard drives not found" error message, and then choice of F1 to continue or F2 to go into setup. In the BIOS sometimes the drive status says "OFF" and sometimes "UNKNOWN."
All other BIOS settings appear correct as before, and the system appears to function normally except for the inability to access hard drives (floppy and CD access is fine).
Any suggestions on diagnostics would be appreciated!