Vacunita's first suggestion is best.
However, if you find that connecting the drive directly into a computer still doesn't work, check out the following whilst it's still cabled up to that PC:
1. Is BIOS recognising the drive?
2. Can you hear if the drive is spinning?
If it's not recognised, but is spinning, you could try changing the pcb controller board on the bottom of the drive. You will need to obtain one from an identical drive preferably with the same pcb revision number.
It will all come down to what value you place on the data...
ROGER - G0AOZ.