Apple iMac G5, 20-inch - Manual (Page 7)

iMac G5 (20-inch) Take Apart - Removing the Back Cover
4. Locate the three case screws circled below. You may have to lift the metal foot to
locate the middle case screw. Note: These screws are captive; they are part of the
display/bezel assembly and cannot be removed.
5. Using the tool provided, or a Phillips #1 screwdriver, loosen the three captive screws.
Note: Turn the screws counterclockwise until they stop turning.
6. Holding the back cover by the metal foot, tilt the cover up and lift it off the computer.
Set the back cover aside