SOLVED @ 07/14/2018 My TiVo has completely lost the HD menus and will not switch back to them when selected in settings. I've contacted TiVo support and I have done the following... - Power cycled the unit (multiple time) - Repeated Guided Set-Up (multiple time) - Clear and deleted everything - Tried thumbs down-thumbs up-play-play - Tried thumbs down-thumbs up-pause-pause - Hard start then at welcome screen just as the yellow ring lights select pause-5-7 at this point I get a green screen that says the TiVo box has a serious problem. It completes this process then restarts and still no HD menus. - I reinstalled the original 320GB drive and same issue - Reinstalled a clean TCD746320 original image - Tried multiple HDMI cables - Tried a newer HDTV The TiVo's Details - Model: TCD746320 - Software Version: 20.7.4.RC42-746-2746 - Unit was upgraded with a TCD746500 HD with no issues Any suggestions on this weird glitch? Thanks! - Richard Menu shows it's capable to show the HDUI but UI is in classic.