I have one of my receivers attached to an "old" DirecTV dish. The rest are connected to the new 5 LNB dish. I realize I wouldn't get any of the new HD channels connected to an old dish, but figured I would still be able to get the HD channels that have been around for a while now (ESPN, locals, etc.). And that was the case...until recently. Those old HD channels are suddenly giving me the 721 error "Searching for satellite signal." All I can figure is they moved all the HD channels to one of the new satellites (103b?)? Or could something else have happened?