We have a Panasonic DVD-RV21 that all of a sudden has been unable to play proper format DVD's. We started watching a movie, stopped it as we were getting sleepy, and started it over at a later date. At that later date - it did not play.

The only thing that happened in the interim between playing correctly and not recognizing the format was that the remote for the DirecTV HD DVR was set on AV1 and several buttons (unknown sequence or specificity) were pushed. I believe that the DVD Player should play independent of what the DVR is set to (or even on) however it seems that something has changed the default codes in the DVD Player.

Is there a way to reset it back to "normal"? How could the DVR remote affect the DVD Player?