Dell PowerEdge R905 - Manual (Page 141)

Installing System Components
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5 Close the system. See "Closing the System" on page 68.
6 Reconnect the system to its electrical outlet and turn the system on,
including any attached peripherals.
Processor Expansion Module Board
Removing the PEM Board
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 67.
3 Remove the PEM. See "Removing the PEM or PEM Shell" on page 75.
4 Remove the PEM cooling shroud. See Figure 3-9.
5 Remove the PEM board:
a Pull up the spring-loaded blue retention pin located in the center of
the PEM board, and then slide the board toward the front of the PEM
shell until it stops. See Figure 3-34.
b Lift the PEM board out of the PEM shell.