Hi all. I've just purchased a Panasonic TX 28 DTX1. I can't seem to get stereo sound out of it. When I put the sound menu up a message of no service next to the Nicam on off button is showing. The setup is via NTL cable. Also, don't know if this is related, but I get nothing if I connect the NTL box to the TV with a scart cable. I can only get a picture if I connect the two with an RF lead. Am I doing something wrong. I'm afraid I'm not very technical minded, so please treat me gently. Thank you in advance for any help you can give.