Apple iMac (21.5 and 27-inch, Late 2009) - Manual (Page 38)

38 Chapter 3 Boost Your Memory
4 Raise the stand and use a Phillips #2 screwdriver to loosen the three captive screws on
the memory access door. Turn them counterclockwise.
5 Remove the memory access door and set it aside.
Phillips
screwdriver
Raise
stand
Memory
access
door
®