If you don’t have an Apple Macintosh keyboard, you miss out on the “eject button”. This is a shame really. The easiest way to eject the CD is to drag it to the recycle bin, or if you have a Windows mouse as well you can right-click and select eject. Should you have a Macintosh mouse, option-click and select eject. If all else fails, reboot the computer and hold down the left mouse button (or only mouse button), and the CD will eject for you. If this STILL doesn’t work, you can go into OpenFirmware and tell the Apple computer to eject using the command:
0 > eject cd
Hope that helps!