Went to upgrade my Nav with the latest 2012 disk (07 E70 4.8) and it said the System had to be restarted to use the new DVD as it was a newer version. The box set came with a note inside saying to restart the system you can press both eject buttons for the CD & DVD together with the mute/volume controller for ten seconds and it will restart... well all I have now is a white screen ? all functions work radio MP3 connector etc, but no display ? Voice recognition wont operate any controls for the display either, such as adjusting brightness etc ... any ideas guys ?

Should say .. I tried putting the 07 disk back in, but the screen stays blank .. I have the TV option which works ok, just no display, and I have a shortcut button to the Nav system that says the navigation system is ready ?