Dell OptiPlex 755 User Manual page 76

9 Pivot the socket release lever back toward the socket, and snap it into place to secure the processor.
10 Clean the thermal grease from the bottom of the heat sink.
NOTICE:
Ensure that you apply new thermal grease. New thermal grease is critical for ensuring adequate thermal
bonding, which is a requirement for optimal processor operation.
11 Apply the new thermal grease to the top of the processor.
12 Install the heat sink assembly:
Place the heat sink assembly back onto the heat-sink assembly bracket.
a
Rotate the heat sink assembly down towards the computer base and tighten the two captive
b
screws.
NOTICE:
Ensure that the heat sink assembly is correctly seated and secure.
1 heat sink assembly
13 Replace the computer cover (see "Replacing the Computer Cover" on page 317).
76
Processor
2 heat-sink assembly bracket
1
3
3 captive screw housing (2)
2