E39 telephone problem

Hi all, I just bought a 97 540 and when I plug the cable from the build in phone in, the screen lights up, but when I want to put my card in and activate it, I need to push the 'circle with dot' button and it should ask for my PIN if I have it correctly? But it doesn't ask for anything and it seems like the display goes death. I don't get any help of the local dealer because he's supposed to be fully booked for 2 weeks??? (it's in spain and nobody likes to work to much here) So could somebody help me here in the right direction?
Thanks