Dell Vostro 400 (Mid 2007) - Manual (Page 158)

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Removing and Installing Parts
4 Replace the computer cover (see "Replacing the Computer Cover" on
page 166).
5 Connect your computer and devices to an electrical outlet, and turn
them on.
Processor
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions located in the Product Information Guide.
Removing the Processor
1 Follow the procedures in "Before You Begin" on page 101.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 103).
CAUTION:
Despite having a plastic shield, the heat sink assembly may be very
hot during normal operation. Be sure that it has had sufficient time to cool before
you touch it.
3 Remove the processor fan/heat sink assembly from the computer (see
"Removing the Processor Fan/Heat Sink Assembly" on page 156).
NOTICE:
Unless a new heat sink is required for the new processor, reuse the
original heat sink assembly when you replace the processor.
4 At the processor, place your finger upon the hook end of the release lever,
then push down and out to release it from the tab that secures it.