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Old 01-14-2013, 04:12 PM   #2
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Join Date: Apr 2004
Location: Caledon
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Could be the DSP, the small little box next to the head unit, where you can adjust the equalizer. When that stops working, everything shuts down.

You may find more info regarding this on Bimmerforums 7 Series subsection as there are a lot more owners, and someone has definitely had this issue and has fixed it.

Another great resource is bookmark it!
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