Apple iMac G5, 20-inch - Manual (Page 102)

100 - iMac G5 (20-inch) Take Apart Hard Drive Duct
Replacing the Hard Drive Duct
1. Place the hard drive duct over the logic board so that the bottom of the duct fits into
the edge of the heat shield without any gaps.
2. Replace the two screws.
Replacement Note: Although the screws are the same length, the head shape
differs. Replace the screw with the thicker head into the fully recessed screw hole.
3. Replace the back cover.