Is swapping the PCB on a bad hard drive worth a shot? It spins up but is not recognized in any USB ports when externally mounted to windows/linux machine. pardon my lack of knowledge, wording might be wrong - I'm an engineer and know "about" computers but am not computer savy...if that makes sense?

This youtube video shows a clicking (presumed unrecognized) HDD and he swaps the PCB and it works. Is this BS, 1 in a million or worth a shot? For as cheap as it is and I can install the "new" drive into the laptop to getting it working again it's worth it.
http://www.youtube.com/watch?v=PoVBHG4k ... re=related

8 month old Dell was left on in the case all night (standby I assume), battery went dead. Recharged it the next morning and it wouldn't do anything. Hard drive is unrecognized in other machines I mounted it in externally. Did that leaving it on all night cause it to overheat/fail - and if so what part it likely hosed?

I guess I'll follow up with recovery recommendations when this doesn't work. Or "where do i buy a platter exchanger!!!"

Seagate 7200.4 500GB hard drive.

When the drive spins up, what do you ear? Do you ear the heads moving and calibrating or no noises?