My Tivo HD recently stopped working. It boots to the Welcome Screen and then just goes to black screen and my TV displays message No Signal. I have removed the hard drive and run the wd diagnostics as well as hddscan on it and they come back fine. The Tivo fan is still running and I can hear the drive still spinning. I'm not sure what else to check. I hooked the Tivo up to a different tv and cable just to make it was not that and had the same issue. Any ideas on what to check? I actually ordered a new Tivo Premiere to replace this HD but would like to repair the HD if possible so I can sell it for at least a few bucks.