radio/cd stacker not working after disconnecting battery
 

Radio /CD stacker not working or playing (on my c200 elegance 1999 yr w202) after I disconnected battery for 5 minutes in order to help solve another issue which was my front window was getting stuck and this diconnecting the battery was suggested. Window still not working (getting stuck quarter way down). But now I have this problem with radio/CD player.Their is some sign of life in the radio as the little screen shows these symbols ( "-- --") hope that makes sense. and sometimes i can get it to show the numbers like1,2,3,,4 ,5 or 6 depending on what buttons i press. My guess is there must be sequence of numbers to press or not. I'm in a real quanry as to how to get the thing working again. Please anyone suggestions please.

did it ask for the CODE ?? enter it