I have some HD's that I used in a PC that had a faulty power supply. Both the PC and my Mac recognise the HD's, can format them, etc. BUT when I use Norton Ghost on a PC to make a backup copy on one of these HDs will not boot afterwards like they should. The identical procedure on good HD's works. They even wont boot if they are formatted and then Windows installed on them. So the drives were damaged somehow by the faulty power supply. I'm trying to find a way to repair them. Anyone have any ideas?