Dell Vostro 400 (Mid 2007) - Manual (Page 167)

Removing and Installing Parts
167
7 Move the computer to the upright position.
NOTICE:
To connect a network cable, first plug the cable into the network device
and then plug it into the computer.
NOTICE:
Ensure that none of the system air vents are blocked. Blocking them can
cause serious thermal problems.
1 computer cover tab 2 slot
3 computer cover 4 front of the computer
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3
1
2