make sure your receiver is not the problem change channel manually if that don't work then is your Remote Control..
how to fix dead remote
1. take the batteries out press each key 1 time only but make sure you press all keys on remote, after then you Insert the batteries in again power on the receiver then with remote power off then on again then try entering a channel example ch 200 and go on from there to see if that fix the problem Make sure you put in new batteries also.
If that did not work then is time for a new Remote