Not working is kind of generic.. Symptoms
Does it do NOTHING
Does it try to lock on to a satellite but can not succeed
Are you a DISH NETWORK customer or DirecTV
Domes: Do not work on DirecHDTV, period, they do work on DirecTV (no HD)
on dish they can work on both SD and HD BUT... Dish recently did a software upgrade on their satellites,, Older domes no longer can lock on them, Now SOME domes may be upgradable, but frankly that's above my pay grade and I can no longer send you to the man who knows (He hung out on a different forum family and management ran him off..... I think they wanted a professional sponsorship from him and he's not that rich).