Replacing the Memory
1.With the computer face down, orient the notch on the DIMM with the notch in the memory slot. In this case, the notch is on the left.
2.With your fingers, press the DIMM fully into the slot until you hear a click. Repeat for the other DIMM slot.
3.Fold the black tab over each DIMM.
4.Replace the memory access door.
5.Use a Phillips #2 screwdriver to tighten the captive screw on the memory access door.
6.Make sure the computer recognizes the new memory by opening System Profiler, clicking
More Info, and clicking Memory.
iMac