How to open CD/DVD tray if the MacPro won't boot

Just a few days ago I updated my version Safari on a MacPro. After the upgrade, my computer, I got a message on the reboot that said that it cannot read the disks I inserted. Since then, I can't get the machine to start at all. I'd like to boot it up from a CD/DVD (Drive Genius) but can't figure out how to get the tray to open to let me insert it. (1) Has anyone had such issues with updating Safari? (2) How can I get the tray to open if I can't get the machine to boot up to start with? (I've tried rebooting and holding down the "c" key. I've tried "target disk" mode but that doesn't get me anywhere.) (I think it may have 10.5.8 OSX and two internal drives.)

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.

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