|... <F2> in the bios setup for this unknown pc can you see the harddrive listed?|
... perhaps enable an auto detect function and make sure it's in the booting order sequence.
... you should be able to boot from cd/dvd and run "CHKDSK" if its set to boot from that device providing the harddrive is seen!
... save settings on exit of bios.
... have you not opened up the machine to check the drive or removed any roaches from the fan?
... a piece of wooden batten (or similar) onto the drive to your ear (push onto bone) should let you know!
... Posting is provided "AS IS" with no warranties