CD drive not reading and ejecting disk

I was trying to import a cd into my macbook pro this afternoon and it went in and clicked into place but then started making a huming sort of noise, but was you could hear it was not spinning, about 20 seconds later it ejected. I tried it multiple times and restarted my computer but nothing seemed to help. the disk drive isn't bent out of shape or anything and I've never had a problem with it until now. Any ideas as to what might be up and how I could go about fixing it?