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Hello and welcome to JustAnswer BMW,
My name is XXXXX XXXXX it will be my pleasure to assist you today.
This behaviour usually (well, pretty much always) indicates a failure of the changer. I would unhook the car's battery for an hour to reset the system, but almost certainly the changer will need to be replaced.
I am sorry I can't have better news, but this is the reality of the situation and is a truthful and accurate answer to your question. I do trust that my honesty and quick response is appreciated.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
It has been my pleasure to help today and I wish you the best of luck with the vehicle.
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thank you in advance.