Why does my on-screen program Guide show "????" when I tune to a channel on the Guide?

If you attempt to tune to a channel that doesn’t exist, the on-screen program Guide may display “????” instead of a channel number. You can set the Guide to tune to the next highest channel by following these steps:

  1. Press the SETTINGS button on your remote.
  2. Using the LEFT/RIGHT arrow buttons, highlight HIGH DEFINITION.
  3. Using the UP/DOWN arrow buttons, highlight Nearest Tune.
  4. Press SELECT to toggle between OFF and ON.