I just purchased my new home theater. I have the Sony 51WS500 51" HDTV, Sony STR-DE685 A/V receiver, Dish PVR 501, and XBOX. Also, Sony SA-VE335 for speakers. Sound has been excellent, and watching XBOX DVD and games is crystal clear. But when watching Dish the Sony 51" TV is blurry. I have a 27" CRT upstairs that is clear and using straight RF connecters. I am using S-Video for the Sony and used AVIA setup disk but still blurry. HELP!