I understand that the S640 will not play burned cd's, but I have some store bought cd's that my stereo does not play. It's really frustrating. sometimes i have to fight it and it will eventually work and sometimes it will repeatedly eject the cd and i just accept that it's not going to read the cd. I'm not sure how old the stereo is because I bought it with a used car, but I was wondering if the age of the stereo might be a problem.