No display with DVD, VCR, or tuner

TV was working fine, then I accidentally hit the r-tune
button on the remote. Now, no display w/tuner, DVD, or VCR.

Display works fine in setup modes, and if I play a VCR
(getting sound only) and go into video menu adjust, I get the picture while the settings are displayed. It's as if
the TV went to an illegal channel and I can't clear it out
of memory. Reset all unit memory functions does not help; it
then comes up in CH AUTO SET PROCESSING (blue background), but when finished, screen then goes off (gray). I also am
able to get blue screen back if I hold down the channel
button (it then comes on showing the channels changing),
but it then disappears once I get off the channel button.

I think I need some kind of massive reset or maintenance
mode access. Any suggestions?