You may want to check to make sure that the tv output select (Menu > Options > Output Select > enter ) is set to fixed and not variable. Also. bypass the HD box and run the coaxial straight into the tv from the wall. If you have sound chances are you need to reset your cable box.
This hapen only on HDMI conection. Try to update the firmware, but beeing in warranty you should call an authorized tech. If your from Montreal area I can do it for you.
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