My Toshiba 55in LED pretty much just stopped working one day. It is only 1 year old. It will NOT find a valid input signal, althought we have verified the validity of the signal (i.e. can route to another TV which does not complain). There is an LED that blinks periodically and methodically like it is searching all input avenues, but not finding anything.. I really hate to think something just croaked hardware-wise, but am willing to replace parts if necessary.