Actually the card only need 'pairing' if you have premium channels like sport or movies. If you do not have any premium channels and have not used your card for ages it will not have received a 'Stay Alive' signal from Sky. If this is the case, leave the card in the box with the box on or in standby for (I'm afraid) up to three days for it to get a Stay Alive signal.
Terry, July 2006