I just got my iMac yesterday and having some teething troubles. I put in an audio CD for the first time and I got a prompt from iTunes. Too busy at present, I shut iTunes down and tried to eject the CD using Command-E and the same instruction from the menu bar. The CD is still stuck in the drive. Shouldn't I be able to see the CD drive or an icon representing the disc on my desktop? There's nothing there. How do I get the CD out?