The
firmware update for your model is required for running OS X regardless of which version you install. You will need to install OS 9.1 or later in order to install the firmware update if the computer has not been updated.
OS 9 should have been included with the computer as part of the original software that came with it. You can install OS 9 on the same volume on which OS X is currently installed or you can erase the drive before installing OS 9. After you perform the firmware update you can do an Erase and Install of Panther.
You should avoid using a pin to forcibly remove a disc from the optical drive. Just restart the computer and hold down the mouse button to have the disc ejected. See the following:
Five ways to eject a stuck CD or DVD from the optical drive
Ejecting the stuck disc can usually be done in one of the following ways:
1. Restart the computer and after the chime press and hold down the left mouse button until the disc ejects.
2. Press the Eject button on your keyboard.
3. Click on the Eject button in the menubar.
4. Press COMMAND-E.
5. If none of the above work try this:
Open the Terminal application in your Utilities folder. At the prompt enter or paste the following:
/usr/bin/drutil eject.
If this fails then try this:
Boot the computer into single-user mode. At the prompt enter the same command as used above. To restart the computer enter "reboot" at the prompt without quotes.