My cable provider (CinciBell Lebanon) is upgrading their channels to MPEG4 from MPEG2, and my 2 Series 3 HD Tivos (1 on a lifetime sub ) won't show anything on the channels with MPEG4, while my newer Premiere is having no problems. No error about not getting the channel and the channel strength meter shows green. Just no picture or sound. I had the technician out today and he swapped in new cable cards and no difference. I hope this is fixable because CinciBell is going to change all there channels to MPEG4 so the 2 Tivo HDs will be turn into power consuming bricks if not.