If i press and channel change button the set begins to recycle through every station and will not stop until I power down the TV. When I turn the TV back on it hold the channel it was on when it was power off. If I try to change the channel it begins cycling again, I tried using the remote to reset to factory by holding reset button and trying to powere down tv and wait for it to restart while holding both power and reset button down. The tv did power off but would not restart. Any suggestions?? Thanks