I have a Tivo HD (TCD652160) with lifetime service that I was planning to give to my father who lives on the east coast. I shipped it to him and it initially worked, but after a day or two it was getting stuck on "Welcome! Powering Up" and continually rebooting. I tried a known good hard drive and that didn't fix the issue. Thinking it was probably a bad power supply, I purchased a second inexpensive Tivo HD off Craigslist that works fine but lacks lifetime service so that I could poach its power supply to use in the first unit. I had the first unit shipped back to me on the west coast and before replacing anything I plugged it in and it unexpectedly worked fine. Unfortunately, it's reverted to the "Welcome! Powering Up" loop since that first boot up. I opened up the first Tivo HD and its power supply appeared to have one slightly bulging capacitor so I went ahead and swapped power supplies. The first unit continued to be stuck in the "Welcome! Powering Up" loop and the 2nd unit continued to work fine with the presumed bad power supply. So I went ahead and swapped hard drives but the problem continued in the first unit. The only thing plugged into the back was the power cord and the HDMI cable. The same power cord works fine on the 2nd unit. I tried removing the HDMI cable and plugging in composite video instead but the problem continued. There are no cable cards, external drives or network adapters/cables connected. Are there any other options I can try? Is there anything I can easily test with a multimeter that might narrow down the problem? Thanks!