My friend sat on the dish network remote and my tv went to component 1 input. When I tried to change it back to the tv input it wont let me. A message pops up saying check external input link. There is not even anything hooked up to any input. The Cable box is hooked up to another tv and this one runs off signal. Has anyone else had this problem or know how to fix it? Tv is 50in lg plasma. Only 3 months old. Thanks