Very doubtful its the 'power supply not large enough' for a single drive. The 1tb drive uses no more power than the stock drive.
I would try the ebay hard drive on the old unit and see what happens. If that fails, its likely the dying power supply took out something on the motherboard. With lifetime on it, its worth repairing. I would contact Weaknees for path forward.
Bolt with 2TB drive along with a Roamio, a Premiere and a mini. OTA. kmttg, pyTivo, running with a 78TB Synology 1511 NAS....serving up the world.
Setup help for pytivo under windows:
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