There is blue bar on the TV screen that says "Not Authorized"

The most likely reason you are seeing this is because your set top box may be tuned to a premium channel that you do not subscribe to, for example: HBO, Showtime, Cinemax, etc.
If you know that you should be receiving the channel that your set top box is tuned to, but still get the "Not Authorized" message, power cycle the box as described above. If that does not solve the problem, please call Customer Service to let them know there's a problem.