I just moved my glorystar Mercury II reciever from one shelf to another in my entertainment center (something I have done before). The move necessitated unplugging the unit and disconnecting the coax connection and the RCA style plugs from the back. Now that I've put everything back together, the box displays the channel number on the numeric display and the TV shows a dialogue box that states no signal. I have checked all my connections and they look good. What can I do?