25345: Power Mac G4 (QuickSilver): How to Open Empty CD/DVD Tray explains how to open an empty CD/DVD tray in a Power Mac G4 (QuickSilver) when using a keyboard that does not have an Eject key.

The DVD tray is connected to a series of gears, a motor and a rubber belt. When the motor is engaged, it turns the belt, which in turn moves the gears that open or close the tray.

This should cause the tray to open a bit, and your can open the tray fully with your hands. Ensure the disc in the system isn’t sticky or gooey, causing the tray to jam.