I have a standard 18" oval, dual LNB DirecTV system. In order for either receiver to work correctly, both systems need to be working. For example, one of my receivers went bad (won't get power) and now since it is out, the other reciever (which has power) will not work. I keep getting the "acquiring satellite signal" and nothing else. The lines from the dish are separate. DirecTV says this shouldn't happen as either system should be able to work with the other unhooked. Any ideas?