Why won't my CDR drive open?

i’ve got a pretty reliable dell, with a CD drive, and a CDR drive. i just burned a new cd with itunes, but it won’t eject/open. the activity light doesn’t even blink, even though it should. i’ve tryed manually ejecting it, and ejecting with itunes and windows media player. i want my cd! if i shut my computer off or reboot it, am i going to lose or damage my cd?