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Welcome to TSF,
Memory popped into my head first-corrupt memory writes corrupt data to drive, eventually it doesn't boot but that wouldn't cause non-detection in another computer. Non detection would indicate a bad controller.
I'd start with checking the AC adaptor with a multimeter- after that, the components that would make up a desktop power supply are on the mainboard, basically voltage requlators that change the voltage to the various components. It might be worth it to open the old drive and see if there's any sign of electrical arcing, or blackened areas on the controller (the green circuit board). you might check the mainboard as well-replacing drives get's expensive
You could also read the SMART drive statictics to see if any of the drive parameters are out of the ordinary already
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