here's what I found with a quick search.
Solutions
First try the normal methods to remove the disc. Drag its icon to the Trash can in the dock or 'Eject' in the file menu.
Shut down the computer and start up whilst holding down the mouse button. This may take some time, but keep your finger on the mouse button right up until the disc comes out or the computer has started up.
Using Toast Titanium; choose the EJECT DISC from the menubar.
Sometimes you can successfully use the eject disc button in iTunes even if the disc is not visible to the Finder
Some Macintoshes have a paperclip hole that you can insert a straightened paperclip into, manually triggering the eject mechanism.
Restart the computer while holding down command-option-o-f, to enter the open firmware dialogue. At the command promp, enter "eject cd" without the quotes, and press return. The disk will pop out. Then type "mac-boot" without the quotes. Press return, and the computer will continue the startup.
Open Terminal and type "drutil tray eject" to eject the disc/tray, and "drutil tray close" to close it.
Solutions
First try the normal methods to remove the disc. Drag its icon to the Trash can in the dock or 'Eject' in the file menu.
Shut down the computer and start up whilst holding down the mouse button. This may take some time, but keep your finger on the mouse button right up until the disc comes out or the computer has started up.
Using Toast Titanium; choose the EJECT DISC from the menubar.
Sometimes you can successfully use the eject disc button in iTunes even if the disc is not visible to the Finder
Some Macintoshes have a paperclip hole that you can insert a straightened paperclip into, manually triggering the eject mechanism.
Restart the computer while holding down command-option-o-f, to enter the open firmware dialogue. At the command promp, enter "eject cd" without the quotes, and press return. The disk will pop out. Then type "mac-boot" without the quotes. Press return, and the computer will continue the startup.
Open Terminal and type "drutil tray eject" to eject the disc/tray, and "drutil tray close" to close it.