hey everyone, I searched through radio related posts, and didn't find any information on my problem. I have a factory radio, with reset code, in my '91 300E, however... Anytime i can get my radio to turn on, all i get is a screen full of symbols that look a lot like asterisks. I'm not entirely sure what to do. I do have a spare factory radio that i could install if i have too, but i'd like to not tear apart my car.

All help is greatly appreciated!