I have a 2007 MB E350. 2 days ago I started getting a "Navigaion Device Unavailable" message on the command screen. I have tried to eject the disk from the nav system in the trunk but it does not eject. Any ideas on repair..?? Does the system need to be re-booted?? My Sirius system was turned off about the same time when my subscription expired. I have had the Sirius turned back on, but the nav still not working. I was hoping the 2 systems were linked somehow. HELP!!!