I have installed a M$ Windows hard disk in one of the two slots. Unable to eject optical drive by pressing the ^ key above delete. Installed USB external drive. Attempted to boot with a 10.4 disk I found Attempted to boot with a 10.4 server disk Attempted to boot with a Mac OS 9 featuring sherlock 2 CD All I get is the gong and then a logo of "?" and "happy mac face" alternating. After few minutes of this the fans start to spin up and up. Is it possible the G5 logic is unable to read / mount modern USB DVD drive? I had a Dell FW400 optical drive long ago and gave it away. I am able to boot the G5 into Target Disk Mode and have formatted the HD properly.