HP RP7 Model 7800 Maintenance And Service Manual page 108

8. Lift the heat sink from atop the processor and set it on its side to keep from contaminating the
work area with thermal grease.
Figure 8-5
When reinstalling the heat sink, make sure that its bottom has been cleaned with an alcohol wipe and
fresh thermal grease has been applied to the top of the processor.
CAUTION:
98 Chapter 8 Removal and Replacement Procedures
Removing the heat sink
Tighten heat sink retaining screws in the order stamped on the heat sink.