Hey all, I bought a new 2015 nav DVD. When I inserted it, it asked me to shut down the nav and wait 5 minutes. Looking for an on/off button, couldn't find one. Googled and found that you can reboot the nav by holding down the DVD and CD eject buttons and then pushing the mute radio button down by the radio. Worked like a charm FWIW.

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'08 X5 4.8i
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'73 2002 4spd