First, try this terminal command:

drutil tray eject 0

You can do this several times. If that doesn't work, and if you can boot into open firmware (with Command Option O F held down), you can type:

eject cd

If that doesn't work, and you want to open up the drive, there is a guide here, but this is a super last resort.

[quote|Sterling Hirsh]First, try this terminal command: drutil tray eject 0 You can do this several times. If that doesn't work, and if you can boot into open firmware (with Command Option O F held down), you can type: eject cd If that doesn't work, and you want to open up the drive, there is a guide [http://www.ifixit.com/Guide/Repair/Jammed-Optical-Drives/772/1|here], but this is a super last resort.[/quote]