I tried to repair a Tivo had was refusing to boot by replacing the power supply. For grins, I also replaced the hard drive. The Tivo now boots fine, connects to the Tivo service over the wired Ethernet adapter, etc. What it does not do now, is display television. This is using standard coaxial cable (no box) to the RF In and coaxial cable from RF Out to the TV. Tivo is viewed on channel 4. Here's the strangest part--TV passes through the Tivo so that you can watch all the channels. Once you switch to Tivo, you can see all the menus, but nothing records, nor can you watch Live TV. The message states the "Tivo DVR lost the standard cable signal". All the suggested items have been tried (plus "crazy" ones like switching the coax in and coax out). The Tivo never exhibited any problems with the cable signal prior to the repairs. It would seem that I damaged something, but I'm not sure how or what to try next. Constructive criticism appreciated! Thanks, all.