Turn your TV on and select the correct video input to view the System menu.
on the remote, press the system button.
press the right arrow to scroll to the "media center" icon at the top of the menu.
press the down arrow to scroll to "optical source."
press the right arrow, then the up or down arrow to select the input that is using the optical connection ("tv," "cbl-sat," "vcr" or "aux").
note: check to be sure that the input selected matches the one you are using: tv, cbl-sat, vcr or aux.