Are you having problems accessing channel(s) that you subscribe to? Are these channels appearing in red in the programming guide? This can happen when a receiver has been unplugged or inactive for an extended period of time. The programming profile inside your receiver is out of sync with the actual programming that you subscribe to.
To get your channels, first try to re-set your receiver (post #2) and failing that you can try receiver synchronization (post #3).
To get your channels, first try to re-set your receiver (post #2) and failing that you can try receiver synchronization (post #3).