Hooked up like this for the last year !! Tired of trying to get through to Mitsubishi !! Tired of trying to figure it out for myself and Direct TV hooked it up !! OK answers to your questions...
1.Model # XXXXX 55413
2.There is a cable called MonitorLink/DVI from TV to Cable Box HDMI insert
Also have S cable not hooked up !
Red, White & Yellow Cable from Input 1 of TV to Audio Out of Cable Box
3.TV Picture comes in on Input-1 and that is it...
Tried reading Manuel,tried formatting, hope you can help.