"Large black box" indicates that the TEXT service is enabled. With many televisions, there are five or nine settings for closed captioning: "Off", "CC1", "CC2", "CC3", "CC4", "TEXT1", "TEXT2", "TEXT3", "TEXT4". The second through fifth are four possible closed captioning streams (though typically only CC1 is active), and the remaining four are for the text description service.
So if you had turned on closed captioning, you might have needed to press a selection that will change your setting from CC2, to CC3, to CC4, to Text1, to Text2, Text3 and Text4, then off will appear.
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