Dell Inspiron DCMA Owner's Manual page 149

NOTICE:
To avoid damage, ensure that the processor aligns properly with the
socket, and do not use excessive force when you install the processor.
5 Set the processor lightly in the socket and ensure that the processor is
positioned correctly.
6 While lightly pressing down on the processor, rotate the release lever back
toward the system board until it snaps into place, securing the processor.
7 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.
8 Apply the new thermal grease to the top of the processor.
NOTICE:
Ensure that the floppy drive and audio cables are not routed so that they
are pinched when the heat sink assembly is installed.
9 Install the heat sink assembly:
Place the heat sink and fan assembly back onto the heat-sink assembly
a
bracket.
Ensure that the two clamp grips are aligned with the two bracket
b
projections.
Hold the heat sink fan assembly in place and rotate the clamp lever
c
180 degrees clockwise to secure the heat sink and fan assembly.
NOTICE:
Ensure that the heat sink assembly is correctly seated and secure.
Removing and Installing Parts
149