This sounds like a cable issue. Assuming your Dish receiver is connected to your TV with a HDMI cable (ends are rectangular and the connector is trapezoid in shape), you can first attempt to switch HDMI ports on the back of your TV. If you get the same message, you can try flip the cable end for end -- plug the TV end into the receiver and the receiver end into the TV (I know, sounds silly, but has worked for me). Next is a new (better -- don't get a $5 cable, most good HDMI cables start close to $20 and up depending on length).
Now if you happen to be connecting via a "standard" TV cable (RG 6), first make sure that the cable is screwed on snuggly (no wrench needed, just finger tight). Next is to get a new cable.
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