I have a Sony Bravia that has been working with dish receiver for 3 years. Yesterday I switched over to my Apple TV on hdmi3 for a couple of hours, then when I switched back to my disk receiver on hdmi 1, I got no signal message and a blue screen. Called dish. They came out with new receiver. It wouldn't work either. Apple TV still works on my Sony. Connected another TV (Samsung) to old receiver and it works fine with old receiver. Dish technician said my tv has a problem. Any thoughts as to what happens to my Sony TV ?