Are the TiVo HD and TiVo Series 3 power supplies interchangeable? I have a TiVo Series 3 with Lifetime subscription. Recently it went into a loop where it says "almost there", etc. (forget the exact messages). Years ago I upgraded the storage with a 1TB drive. The original drive was placed on a shelf. I put that original drive in. Same result. I'm thinking it might be the power supply. Not too fond of or good at soldering. But, I do have a brand new TiVo HD in a box that has never been opened or activated. I tried to sell it once but got no offers. I wouldn't mind it being an organ donor for the power supply. Would that work?