[luellin]

another thing to check were the cable enters your wall have they put an isolator on the wall box fitted to the wall whthe a large rectangular thing in it wich is to prevent lightning damage but also stops electrical interfearance i have found while installing they should make shure there the new types as well just one output in the middle of it and think its red text on the isolator if the cable comes straight in the wall and then in to the box you probably need the isolators to stop feedback off your mains and any other customers down the road that dont have thyem fitted in