I take it the fan isn't spinning and you don't hear the hard drive spin up when you power the TiVo on.
With PC's I normally start by removing bits one by one to see which component is causing the problem but the TiVo just doesn't have much you can pull out. Might be worth unplugging the fan for a breief period to see if it's shorting or something but it does sound farily bad.
I had to replace a power supply in my TiVo for a different reason (sound dropping out of all things) and have the old one lying around doing nothing (in Ak) but I doubt it would help.
Phillips Series 1 TiVo
Turbonet Network Card, 200GB Seagate HD, ozTiVo Image
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