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go into your menu and find closed caption, someone has accidently set the closed caption mode to text, when the on screen display of channel or volume goes away the box appears. turn off the closed caption feature or switch it to something other than "text" mode, and your box will go away.
the black rectangle appears as soon as the channel indicator goes off. someone has turned on the closed captioning in the menu of the set. it is in the "text" mode. go into the menu and turn off the closed caption feature.