Apple iMac G5, 20-inch - Manual (Page 165)

iMac G5 (20-inch) Take Apart - Midplane Assembly-Short Cut
12. Lower the cable cover, pressing down steadily until the tabs lock the cover into place.
13. Press in the latches on the memory slots in and route the black inverter cable along
the side of the hard drive. Connect the black inverter connector (circled) to the
connector under the gray fan duct. Use a needlenose pliers to push the connector into
the keyed connector. Note: The connector is keyed so it can plug in only one way; the
teeth on the connector face up. Tuck the remaining black cables under the board.