I have a 921 receiver hooked to a Super Dish system and loved it. I built a new home and moved the receiver. The installer could not get the receiver to work at my new house. He thought the 34 switch was possibly bad so he brought back another and still no good. The system actually reboots itself when you plug in the SAT input 1. You can't get to a menu screen or anything it just keeps rebooting itself. If you plug in input 2 and unplug input 1 then it will come up with a 645 and 613 error (it says that this receiver will not work with a legacy switch). I then bypass the switch completely and run the line straight from the dish. It still reboots when input 1 is plugged into receiver. When plugging input 2 only it boots but gives the same 645 error still. I then figured bad recevier, so I took it up the street to my dad's house and plug it in. It works just fine at his house... Call dish and they said "It should work". Can't tell why it won't work. They also said it is strange. It is not a cable issue becasue I got a 622 from upstairs and plug it in and it works like a champ. Any ideas anyone??