Hello and welcome to JustAnswer BMW,My name is Steve and it will be my pleasure to assist you today.
Does the CD player work? Do you get any sound at all?
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Please check your fuses. If the fuses are fine, please read on.
This indicates that your car communication computer (CCC) has failed. This is the unit that controls audio, nav, etc. Sometimes they can just freeze up - you can try unhooking the car's battery for an hour to reset the system.
If the battery reset does not work, then unfortunately you will have to replace the CCC.
I am sorry I cannot have better news for you, but it is the unfortunate reality of the situation, and is a complete and accurate answer to your question.
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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