I have my new Insignia 32 LED TV connected via HDMI to my new Sony STR-DH720 Home Theater AMP. When I turn on the TV it properly turns on the AM and initially sets AMP to TV input but then a few seconds later it swtiches to VIDEO 2 and then I get no sound. If I manually set the AMP back to the TV input I get good video and sound. I want it to stop switching to VIDEO 2 (where nothing is connected) and just stay on TV. Any ideas on why it is switching and how I can make it just stay on TV. The HDMI cable is connected to the correct port on the TV and the AMP.