I have an existing digital home theater system. I simply changed my TV monitors replacing the connections setting for setting on the TV. I apparently inadvertently change a setting because I no longer get any sound thru the theater system from anything within the system, no movie, radio, or TV. If I take the TV off the system I am able to hear as well as see/view programs. Again I get no sound thru the Insignia system. I am able to get video but no audio. Any and all help and info will be greatly appreciated. Oh, by the way I have lost all my manuals which is why I am asking here.