Replaced battery in 2000 LS

I replaced the battery in my 2000 Saturn LS and now my radio/CD/tape
player won't work. I contacted Saturn and they want me to bring it
back to their shop so they can put in some secret code that will
unlock it. 
I really don't have the time to drive down there and have them dink
around with it. That's why I changed my own battery. 
Anyone know what the security code is and the procedure to get it
working?
Thanks,

Sangrateo
SangrateoATanonymousDOTto

Sangrateo
Sangrateo AT Anonymous DOT to