My screen for some reason stopped showing me the navigation and radio functions.only a/c goes on radio says off on the little screen in front of the driver and does not show on the main screen.and the navigation same thing.Maybe a re boot at the dealer any thoughts and or fixes?My car is a 2016 Amg gt s

Do a system reset it is in the menus on your screen.

did it nothing happens

Have you tried pressing the top right button on the console? I’ve accidentally hit it and everything went black.

I had a similar issue - best I remember I had sent some directions from the MB Companion app that got hung up somewhere in cyberspace which caused everything to go black. I (think) killed the directions from the app and re-started the car. Everything has been fine since.