Apple iMac G5, 20-inch - Manual (Page 140)

138 - iMac G5 (20-inch) Take Apart Midplane Assembly
16. Tuck the inverter cables along the edge of the hard drive and next to the memory tabs.
17. Replace the memory module(s) by lining up the notch on the module with the notch on
the slot. Press firmly on the memory module until it clicks into place. Use your thumb
and index finger to push the module into the slot.