iMac (27-inch, Late 2012): Installing or replacing memory
Installation
Turn off your computer by choosing Shut Down from the Apple () menu.
Disconnect the power cord and all other cables from your computer.
Place a soft and clean towel or cloth on the desk or other flat surface to prevent scratching the display.
Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
For this step, use a small, flat-blade screwdriver.
Open the SDRAM compartment door by pressing the the small black button located just above the AC power port.
The SDRAM compartment door will open as the button is pushed in. Remove the compartment door and set it aside. Note: There is a diagram on the underside of the compartment door showing the memory cage levers and the direction of how a DIMM is seated.
Locate two levers on the right and left sides of the memory cage. Push the two memory cage levers on either side outward to release the memory cage.
Once the memory cage is released:
Pull the memory cage levers toward you, allowing you to access each individual DIMM slot.
Remove a DIMM module by pulling the module straight up out .
Replace or install a DIMM by setting it down into the slot and pressing until you feel the DIMM click into the slot.
Once you have all of your modules installed, push the memory cage levers back into the housing until they subtly click back into place.
Replace the RAM compartment door. There is no need to depress the compartment door release button when replacing the compartment door.
Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.
