A power supply that is so borked it can take out a hard disk will probably take out everything else too.

When a hard drive it damaged this way it is very often possible to save it by getting an identical hard that works and swapping the control PCB. This is a very delicate operation since the cables are not meant for end-users to handle but it can be done by an EE or tech.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock