Dell INSPIRON 531S Owner's Manual page 166

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7 Move the computer to the upright position.
NOTICE:
and then plug it into the computer.
NOTICE:
166
Removing and Installing Parts
1 computer cover tab
3 computer cover
To connect a network cable, first plug the cable into the network device
Ensure that none of the air-vents of the system are blocked.
2 slot
4 screws (2)
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3