Like above budgail said, its a tv remote issue. If you can get the original remote and press exit, your good. But if it still hasn't gone away, looks like an update for the tv got screwed up.I would suggest call LG and see if they can help you from there. Here is the number to call 1 (888) 542-2623
The video circuit is compromised and perhaps the circuit board was damaged. This can happen via power surge or age of the devices. With proper test equipment the video circuit can be traced to find the problem.