Seems to me, and by no means am I an expert, that if there aren't any lights at all then I would suspect the rx.  Even if you lost the bind, the LED on the rx should at least flash if nothing else and since you checked the switch to see if power was getting past it, what else could it be?  If there is something else causing it, I sure would like to learn what it is in case I ever come across the same situation.

I would probably send the rx to be checked out.  Then again, that's just me.</p>