I got a bt homehub connected direct to my main pc (working fine) have a wire going into loft connecting to a HP ProCurve 10/100 Hub 12 (HPJ3294A), I then have wire from it to another pc (working fine), I have a WD My Book Live but it doesn't connect for some reason if i plug the wire from direct from the homehub it works fine but not it i connect it to the hub should i be using a crossover cable?