What could stop my stereo from playing in my Mercedes s550 4matic

Hello, This is normal, and it is just a feature to prevent the battery from draining too far to start the vehicle. If after restarting the vehicle and powering on the radio, the radio still will not power on, check your fuse before contacting the dealership for diagnosis.

Is the center screen coming on like normal? If so and you just have no sound you could have an issue with amplifier or a communication issue with the fiber optic system. This is a very complex system so if its not back on yet you may need to have is scanned at the dealer or a European independent shop with the proper tools. Alexhttps://repairpal.com/repair-shops