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your captioning or "text" is on. usually inside the tv menu. if not its your cable or dish box has captioning on. black box usually means its in text mode instead of CC thus the black box rather than text
I have a large black square obscuring the picture. You can see the picture in 1 inch border around the black square. If I reset the input switch, the black square disappears for about one second (the picture is momentarily perfect) and the black square appears again. It is not the cable box because I wired the cable directly into the tv. The same thing happens when I try to play a DVD. Any insights????