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Installing System Components 73
NOTE: After installing a new power supply in a system with two power supplies,
allow several seconds for the system to recognize the power supply and determine
its status. The power-supply status indicator turns green to signify that the power
supply is functioning properly (see Figure 1-4).
Processor Expansion Module
There are two types of processor expansion module assemblies used with your
system:
• If you have a four-processor system, the processor expansion module
(PEM) contains a processor expansion module board with two processor
sockets and 16 memory module sockets.
• If you have a two-processor system, the processor expansion module shell
(PEM shell) contains an air baffle.
NOTICE: The PEM shell must be installed in a two-processor system to ensure
adequate cooling airflow within the system.
Removing the PEM or PEM Shell
CAUTION: Only trained service technicians are authorized to remove the system
cover and access any of the components inside the system. See your Product
Information Guide for complete information about safety precautions, working
inside the computer, and protecting against electrostatic discharge.
1
Turn off the system, including any attached peripherals, and disconnect
the system from the electrical outlet.
2
Open the system. See "Opening the System" on page 65.
3
Lift the handle on the PEM until the PEM is fully disengaged from the
chassis. See Figure 3-7