I have a Hitachi Deskstar capacity 160GB that I feel sure the PCB bit the dust when unplugged while power was on. The board white paper has the following into on it:
OA29695
BA2292-
M5H809
860H
http://www.hddzone.com/hitachi-pcb-oa296250a29625-p-142.html is your donor PCB.
When you get this PCB, you need to move your original PCB’s BIOS to the replacement PCB.