If the CD/DVD drive of a G3 or G4 Macintosh opens or ejects the CD inside the drive during the startup process, the problem could be due to some add-on device plugged into the computer. In particular, a malfunctioning mouse or keyboard could be sending a signal to the system to eject the disk. During a normal startup, a user can eject a CD or DVD by holding down on the mouse button, the eject button at the upper right-hand corner of the keyboard, or the F12 key on older iMacs or iBooks, so a malfunction could mimic those actions and cause the disk to be ejected.
To solve this problem, unplug all external devices and restart the computer to see if the problem still occurs. If the drive does not pop open or eject the disk, then one of the devices plugged into the computer was causing the problem. Take the keyboard by itself and plug it into the computer, then restart the computer and see of the drive opens or the system ejects the disk inside; if it doesn't, plug the mouse in and restart again. Continue to add the equipment back onto the computer one piece at a time and restarting until the drive opens or the system ejects the disk; the last piece of equipment added to the system is responsible for causing the drive to open.
Once the device responsible for causing the problem has been identified, contact the manufacturer of the device about getting it repaired or replaced.
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