Home Theater Questions? Ask a Technician for Answers ASAP
Hello and sorry you're having problems. The issue is one I've seen before and it's with the DirecTv box that is connected to this particular setup- since the channel HD and non-HD programming are decoded within the SAT box, this is where the problem lies. You would first want to reboot the DTV box by disconnecting and reconnecting it to power, next replace the HDMI cable and if the issue persists beyond that then contact DTV and have them swap out this box.
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Okay, well you would run through all those steps as I outlined. Including the very last resort of having DirecTv swap out their box.