regsatxgs

Guys,
Had my fairly pristine 93 GS 121k miles, for about 3 weeks now and it's a great ride. The car didn't have a CD cartridge when I bought and the previous (and only other) owner was a "talk Radio" listener and said he hadn't seen the cartridge in years.
Today I bought a new 12 disk cartridge magazine, loaded several CDs (not burned CD-R type) and it went through its load procedure and then nothing. After a few minutes, it showed the disk #, and then I got "Err" display. It would let me change disks, but none would play??
Does this mean the player is bad? What options do I have. I've used the search, but no conclusive answers.

Thanks for the help.