Dell Vostro 420 Service Manual page 122

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2 Replace the screws that secure the system board to the chassis. Avoid
over-tightening the screws.
CAUTION:
adequate grounding of the system board and result in system failures.
3 Connect the chassis fan cable to the system board.
4 If the system board is being replaced with a new system board:
Install the memory modules onto the system board (see "Replacing or
a
Adding a Memory Module" on page 104).
122
System Board
Failure to replace and tighten all screws properly may not provide
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