Apple iMac G5, 20-inch - Manual (Page 55)

iMac G5 (20-inch) Take Apart - Memory (DIMMs)
Replacing the Memory
1. Remove the replacement memory module from its packaging.
2. Important: The DIMM latches on the logic board are delicate and should be handled
with care to avoid damage.
3. 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.