My problem is that on many occasions I get picture and no sound when turning on my D-tv HR24-500 and my Toshiba 37hl66. I'm up to advanced technicians now and they can't figure it out. Have replaced receiver, multi port box in attic, numerous barrel fittings, cables from wall to receiver, HDMI cable (on 3rd one). No luck with their techs. Have 4 tv's on Direct and the hd w/hr24 receiver is the only one with problem. Is it likely that the 2nd receiver could have been faulty? I've had that problem with computer equipment before, but not often. Anyone have any ideas? Thanls.