Mine did that....the black rectangle came on and stayed on every time I used my tv (but not on all channels) for MONTHS before I figured out the problem.....My CAT had sat on the remote (as usual) and somehow programmed it with his butt to use the "closed captioning" feature.....(something I don't subscribe to as nobody in the household is hearing-impaired...and so the box would be black rather than filled with the captioning)! Your universal remote MUST have a "menu" key, which gives you access to your tv's various features and how to turn them off/on.

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