I'm no NAD guru, but you should be able to take the top cover off by removing the screws on the sides (there maybe a couple on the rear of the unit holding the top on as well) which will allow you to remove the cd, and see if something is jammed-up. You'll want to keep the unit level until you get the cd out, if possible. Sometimes the rubber drive belt that opens and retracts the cd drawer stretches or breaks- if you're handy you can likely replace it yourself.
