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Check the manual for the security code for your vehicle. I'm pretty sure it's a 5 digit code. If you locate it, enter the code into your stereo. You may have to take it to a Mercedes dealer if you cannot find it. If you do have to take it to the dealer, pull the radio out and get the serial number from the side of the radio, the service tech will charge you big bucks if you make him do it. I hope this helps =)
this is because it has been dissconected from a power source for a period of time it is the security on the system, what you will need to do is either find the security key for the radio or find the serial number for the radio and take it to the bmw centre and ask them to unlock it for you or you might be able to find it on the net somewhere using the serial to the radio...hope this helps