|Have you installed any new drivers recently? I'd be inclined to open up the Device Manager and check that there isn't something wrong with the CD ROM. |
Also, what kind of CDs are you trying to play? Are they personal CDs that you've burnt or commercial products?
It's pretty hard to say to be honest. Could even be the fact that the media isn't associated to a program to open it with. If it doesn't know what to use to open, it may just sit there.
The Definitive Guide to Registry Cleaners &