Either they are turned of in the option menu of the set or the signal/main board has a logic switching problem, or the HDMI jacks themselves are bad. You can take a flash light and look into the jacks to see if any of the pins are bent. If they are, the board that they are soldered to must be replaced. I would double check the option menu for setting up the inputs of the tv. This would be my first guess.
I hope this helps.
Skyassoc
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