IBM System x3550 M5 Type 5463 Installation And Service Manual page 277

a. Remove the socket covers from the microprocessor sockets on the new
system board and place them on the microprocessor sockets of the system
board you are removing.
b. Do not allow the thermal grease to come in contact with anything, and
keep each heat sink paired with its microprocessor for reinstallation.
Contact with any surface can compromise the thermal grease and the
microprocessor socket. A mismatch between the microprocessor and its
original heat sink can require the installation of a new heat sink.
11. Disconnect all cables from the system board. Make a list of each cable as you
disconnect it; you can then use this as a checklist when you install the new
system board.
Attention: Disengage all latches, release tabs or locks on cable connectors
when you disconnect all cables from the system board. Failing to release them
before removing the cables will damage the cable sockets on the system board.
The cable sockets on the system board are fragile. Any damage to the cable
sockets may require replacing the system board.
12. Remove the hot-swap fans (see "Removing a thermal kit (hot-swap fan)" on
page 194).
13. For 2.5-inch hard disk drive server models, open the system board retention
lever. For the 3.5-inch hard disk drive server models, press the blue release
tabs and lift the battery or power module holder upward.
Retention lever
Figure 194. Retention lever location for 2.5-inch hard disk drive server models
Chapter 5. Removing and replacing components
261