How do I change from the 16:9 setting. I changed the setting to that somehow. Don't know how I got to that screen. It was a plain white screen with black type. Never saw it before and cannot get back to it.Just as I exited it said changing this setting may affect the audio. Now I have no audio at all. Tried everything to fix it, cannot get back to that screen. I am running thru a Cox cable box, if that helps at all. My email address is SBZZY1@aol.com. Please help me!