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If the power light also changes or goes off there is a problem in your TV. If the power light does not change, the TV is staying on.
Press menu to see if any words come on the screen. If they do, wait for them to go away and make sure your cable box is on.
If the cable box is on, make sure the input/source is the same as where you have something connected to the TV.
If you have a black box in middle of screen go into menu and look for Closed Captions----one of the options there will be TEXT which is a feature never really used for transmitting books and written material.....
In that menu turn the Text off or not on Text 1 and box should go off.
You have your TV in the "Teletext" mode. Go into the TV menu and select the closed-captioning menu and turn off the text function. What you are seeing is the result of the TV's captioning circuit latching onto a false text pilot signal and then throwing up the black box on the screen.
Go to the local Walmart and buy a generic controller and program it to your set. Go to MENU and follow the prompts. The remote will be less than 20 bucks, and you will have a remote that handles the TV, the VCR, the DVD, and the cable box. We go through roughly ten remotes a year. They all make the closed caption go away. One tip: don't lose the manual, or you will need to buy another remote. If the batteries fall out, or go dead, the remote will have to be reprogrammed. Underline the code numbers that work.The black box goes away when the info button on the remote is pressed.