Force CD ejection from SuperDrive
There are lots of ways to get the system to try ejecting the disk, most of them detailed here: http://www.wikihow.com/Eject-a-CD-From-Your-Mac

My favourite is restarting while holding down the mouse/trackpad button.

If the drive is making noises but the disk does not come out, it is possibly hitting or caught on the edge of the slot. I have had success in using something like a business card or piece of paper and inserting it above or below the edge of the disk (or using two cards, one above the disk and one below the disk). When the disk is being pushed out by the mechanism, rather than hitting the edge of the slot, it slides along the card and does not get prevented from being ejected.