Apple iMac G5, 20-inch - Manual (Page 73)

iMac G5 (20-inch) Take Apart - Logic Board
19. Connect the four connectors (two fan cables and two hard drive cables) and replace
the two screws on the video cable.
20. Replace the air deflector located above the I/O ports. There are no screws, it’s held in
place with double-stick tape.