First here is since you have Direct TV if you have not done so have them out to check the signal and hookup of the set and the BOX.
Most that use a box you can reboot the box by unplugging and letting it boot up.
If you are hooked up via the coax fitting it is possible a tuner problem in the set etc.
If rear inputs work for a DVD etc DTV can be hooked to a rear input and should work.
Is it the set or the box if used?
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