Apple iMac (21.5 and 27-inch, Late 2009) - Manual (Page 41)

Chapter 3 Boost Your Memory 41
11 Replace the memory access door and tighten the three captive screws with a
Phillips #2 screwdriver.
12 Hold your iMac by its sides and return it to a standing position. Then reconnect the
cables and power cord.
13 Press the power (®) button on the back of your iMac to turn it on.
WARNING: Remember to replace the memory access door after you install memory.
Your iMac won’t function properly without the memory access door.
Phillips
screwdriver
Raise
stand
Memory
access
door
®