VW has a safety feature on it's radios, when something goes screwy with the car (battery dies) you have to input a code into your radio to get it working again (this is to deter theft of VW stereo systems). I bought my car used from a private seller and inside my owner's manual was a card with the radio code on it...you should check your owner's manual. I have heard you can call VW dealerships with your VIN # to retrieve your radio code but cannot verify that is true. This same thing happened to me when I replaced the battery in my car, only I had the code in hand and radio works fine.