Use this guide to replace the CD-ROM drive in your Power Mac G5.
Remove all the cables, including the power cables before opening the unit.
Lift the tab to unlock the side panel.
Remove the air deflector (the clear plastic cover) by pulling on the handle.
Locate the CD-ROM Drive on the top left corner of desktop.
Pull and rotate latches to the left.
Wiggle and pull out the CD Drive.
Detach the first cable from the CD-ROM drive.
Detach the second cable from the CD-ROM drive.
After the CD-ROM drive is removed, the area should look like this.