Just to reiterate, a) is the led on on the link (where it plugs into the RF socket) when its not working, b) does the remote with the link work the box. If not a) then try the link directly in the box, ruling out or identifying the cable at fault. You could always try another link, but in my experience they're pretty reliable. If not b) then its likely to be the mote (does another one work the box or link) It's just if Sky come out & it's a faulty link they've not recently installed they'll probably bill you.