UKPassats

My radio isn't working properly and I don't know if it's something I've done. The problem is that none of my pre-stored channels will work on their respective buttons. When I switch the car on, there is no sound and a blank lcd screen. None of the buttons will select a channel but if I hit the right or left arrow button, the radio comes on straight away to one of the stations. However, the buttons still won't work so I have to press either left or right to change channel. If I try changing from FM1 to FM2 or AM again no channels until I select left or right.

Has anyone come across this before? Could it be anything to do with the previous nokia phone wiring? I cut it recently but didn't disconnect the cable from the wiring. Any ideas would be helpful. Cheers.