Radio Anti-Theft Code Problem

No this is not another message asking the group where i can get a number to unlock my stereo. I have the number to the stereo, it's a 5 digit #, but when i enter it in nothing happens. I took it to the
dealer and they say it's because there was a tape in the tape deck when the power got disconnected (battery blew up). They so far have no way to help me, but i just want to make sure that I am not getting the run around from my local dealer and that I am not overlooking anything obvious. Any help would be awesome.
walt(er)
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
If you entered the Radio Code more than three times, it locks out further attempts. You need to contact MBUSA to get the radio re-coded.
Remember to press the "*" key after entering the code (it changed on later models, call an MB service desk to ask the sequence). If it still flashes "CODE," you need to contact MBUSA. The radio may have been replaced and is no longer associated with the VIN of the car, or it may be locked out from too many attemps. If it's not working, and not asking for a "CODE" on the display, there's something else wrong with the unit.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.