Got a new TV and now U-Verse is unavailable - DirecTV

Bought a new TV for the living room, switched the old living room TV into the bedroom. After plugging everything back together, I'm getting a message on the bedroom TV saying U-verse is not available. The new TV tells me there is no signal. Everything was working fine before the switch.

This question, "Got a new TV and now U-Verse is unavailable," is about DirecTV channels, programming, equipment, and sports.