Enrique1994

Hey everyone, I am new to MBworld.org. I have a question regarding my command unit radio/navigation, It turns on for about 30 seconds displaying "Mercedes-Benz" then it shuts down. I am not able to use it at all no music no navigation, the dvr works good I am able to eject the nav disc without a problem and the fuse to the amp all seem to work properly as well. Anyone ever had this problem or know how to fix it? Thank you!