Try unplugging the changer from it's harnesses for a few minutes - see if a reboot recovers it. If not I'd say the changer is faulty. If you know someone with another BMW changer you could ask them to let you try it in your car so you know for sure before buying a replacement.

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Cheers, Brian

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2001 X5 4.4i Sport
Black Sapphire, Hi Gloss Shadowline, Full Privacy Glass.
Too Cool for Jack Bauer