IBM System x3550 M4 Installation And Service Manual page 340

Figure 230. Thermal grease
Figure 231. Heat sink installation
11. Reinstall the air baffle (see "Replacing the air baffle" on page 211).
12. Install the cover (see "Replacing the cover" on page 209).
13. Slide the server into the rack.
14. Reconnect the power cords and any cables that you removed.
15. Turn on the peripheral devices and the server.
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IBM System x3550 M4 Type 7914: Installation and Service Guide
a. Remove the plastic protective cover from the bottom of the heat sink.
b. Position the heat sink over the microprocessor. The heat sink is keyed to
assist with proper alignment.
c. Align and place the heat sink on top of the microprocessor in the retention
bracket, thermal material side down.
d. Press firmly on the heat sink.
e. Rotate the heat sink retention module release lever to the closed position
and hook it underneath the lock tab.