Hi shame2012 and welcome.
Are you connecting direct to cable or are you connecting using a cable box?
Check your specifications. I don't think the P3500 Series has a Digital Cable Tuner (DVB-C) - just a Freeview (DVB-T) tuner so you will need to connect through a Cable Set Top Box. I think the P3550 Series has an additional DVB-C Tuner.
Can you give more information on how you are trying to connect.
