Replying to CD not being recognized/ejected???

ok, so after i ripped enjoy using handbreak last night, i ejected enjoy no problem.  then this morning, i went to put PNW into my comp, it made a strange noise that it never has, and ejected it.  i tried it again, worked fine, but coudlnt watch it caause i had to go to class.  then i get back from class, eject it to go watch on my tv, and then realized my dvd player was broken.  so i put it back in my comp, and nothing is happening.  its not recognizing that there is a dvd in, and its not letting me eject it.  anyone have any clue as to what to do.  im kind of freaking out, because now is the worst time for my computer to break.