Hey, Joe. Welcome to the forum, please click the user cp link and complete your profile re: vehicle and location as that information is often very useful.
You posted in the "general" forum but there is a specific forum for your car, the W210 forum, scroll down into the sedans section and you'll see it. From there you will find scandalous amounts of information, including how to fix the missing cd player issue (although first you should try not removing a fuse, but disconnecting the battery, stepping on the brake for a half-minute, then reconnecting the battery) which often works. If you don't know there is an access panel just in front of the rear passenger seat that allows easy battery disconnect. Follow the steps in your manual to reset a few things and re-enter your code, then see how you are.
Take care and enjoy the ride,
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)