Apple IMAC Service Source - Page 175

Procedure, Opening the Computer, power is on, and must be turned off before changing RAM modules.

Page 175 highlights

Procedure Opening the Computer Warning: The computer must be turned off before RAM modules are removed or inserted. To remind you, a red LED is visible in the access door. If the red LED is on, power is on, and must be turned off before changing RAM modules. 1. Shut down the computer. 2. Unplug all cables from the computer except the power cord. 3. Lay the computer down on a soft cloth. 2 - iMac (USB 2.0) Upgrades Memory, SO-DIMM

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2 -
iMac
(USB 2.0)
Upgrades
Memory, SO-DIMM
Procedure
Opening the Computer
Warning:
The computer must be turned off before RAM modules are removed or
inserted. To remind you, a red LED is visible in the access door. If the red LED is on,
power is on, and must be turned off before changing RAM modules.
1.
Shut down the computer.
2.
Unplug all cables from the computer except the power cord.
3.
Lay the computer down on a soft cloth.