I turned it on to check out my Enterprise recording (21-1). When I turned it on, neither the SD or HD light came on. I pressed the output button until the HD light came on, it showed 77-0 UKN. I went to DVR screen and the recording was there so i selected it and "Start Over". I quickly realized it was ABC and not UPN. I stopped the recording and now whenever I tune to 21-1, I get 8-1 instead. I did an automatic scan after deleting 21-1 and it fixed it.