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Sorry to state the obvious, bit just in case, have you checked to be sure the screen is turned on? Press and hold the volume knob for a few seconds. There is also a display off button on the dash to rt. of the display unit.
If all are on, try resetting the unit: http://www.youtube.com/watch?v=vEGuqiS3EGU
No solution, same problem, but had many strange moments: 4 months ago during 100 kms or so it stopped, then suddenly came back, and worked ever since. A few days ago, it started happening again: NAV stuck, then radio dead, and gradually the rest disappeared. I did a Reset, and since that moment I see the intro-screen and then it goes black. Hitting the TEL button is somehow also a Reset...
Do the previous 2 posters have anything to report on this matter? It would be VERY welcome!
I've been having this problem also. I took it to the dealer and they had to load a new update for the mmi system. Luckily mine is covered under warranty.
The other solution is to turn the car off and disconect the car battery for 10 minutes-and then the mmi will reset itself. The problem, however, is that the issue will probably happen again.
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