Dell Vostro 400 (Mid 2007) - Manual (Page 166)

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Removing and Installing Parts
3 Replace the cables that you removed from the system board.
4 Replace the processor and the heat sink assembly (see "Installing the
Processor" on page 159).
NOTICE:
Ensure that the heat sink assembly is correctly seated and secure.
5 Replace the memory modules into the memory sockets at the same
locations from which you removed them (see "DC Power Connector P8"
on page 111).
6 Replace any add-in cards on the system board.
7 Replace the computer cover (see "Replacing the Computer Cover" on
page 166).
8 Connect your computer and devices to an electrical outlet, and turn
them on.
9 Verify that the computer works correctly by running the Dell Diagnostics
(see "Dell Diagnostics" on page 86).
Replacing the Computer Cover
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions located in the Product Information Guide.
1 Ensure that all cables are connected, and fold cables out of the way.
2 Ensure that no tools or extra parts are left inside the computer.
3 Align the tabs at the bottom of the computer cover with the slots located
along the edge of the computer.
4 Press the computer cover down and slide it towards the front of the
computer until you feel a click or feel the computer cover securely
installed.
5 Ensure that the cover is seated correctly.
6 Replace and tighten the two screws that secure the computer cover.