Why doesn't the picture always display in full screen when I'm tuned to a high-definition channel?

Not all programs are in high-definition format; therefore, programs will not always be full-screen. Not every show currently broadcast by an HD station is in HD format. You can assume that if you are getting a picture on the HD channel, your equipment is functioning properly. You may want to check your HD monitor (TV set) settings (consult the HD monitor's user manual).