Set stopped working. It's a 60-inch Magnavox Surround Sound projection TV, Model number PR3061 A105. Problem: Black screen - none of the three lights projecting. Set seems to be locked on one DISH satellite station and audio can be heard. Can adjust volume but can't change channels. Any idea of what might be wrong and if I can fix or need to call specialist?

Gary Worrall, August 2009