I'm having a problem with my CD Drive. When I insert a disk, the computer doesn't recognise it, and acts as though I haven't put in a disk at all. When I open the CD drive, there is no data there. I've tried reinstalling the CD drive, but it hasn't worked. I can hear the CD drive making the noises it makes when it's normally loading a cd, but still nothing comes up on the computer. Does anyone know why this is happening?
Thanks in advance.

EDIT: Ok, I forgot to mention it's a CD/DVD drive. I just tried to play a DVD, and it worked. But CDs aren't.