Have a macbook unibody from fall 2008. Upon trying to insert a CD into the drive, only half of it will enter freely. The system doesn't respond that there's a CD present, and the CD can't be forced in any further. I tried the force-eject on restart, so no CD of any kind is still lodged in there. Pressing the eject button while booted into the OS doesn't produce that little image with the arrow either, it's as if the button isn't functional. Is there some kind of system security I've accidentally triggered that won't accept CD's, or is there something wrong with my drive?