My 1st gen nano was replaced under the recall with a refurbed nano (the tiny square one). It connects up the my iMac fine using the old cable, but when I try to connect it to the dock that I used with the old nano, or to the iPod connector in my car, I get a message on the nano screen that the dock or car connector is an "unrecognized device." It doesn't charge and doesn't play either. Did Apple change the connector? Any help greatly appreciated.