Dell Dimension 8400 Service Manual page 14

7. Before you lower the retention arm, ensure that:
The tops of all cards and filler brackets are flush with the alignment bar.
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The notch in the top of the card or filler bracket fits around the alignment guide.
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8. Press the retention arm into place, securing the card(s) in the computer.
NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer cover from closing properly or
cause damage to the equipment.
9. Connect any cables that should be attached to the card.
See the documentation for the card for information about the card's cable connections.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
10. Close the computer cover, reconnect the computer and devices to electrical outlets, and then turn them on.
11. If you installed a sound card:
a. Enter system setup, select Audio Controller, and then change the setting to Off.
b. Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the microphone, speaker/headphone,
or line-in connectors on the back panel.
12. If you installed an add-in network adapter and want to disable the integrated network adapter:
a. Enter system setup, select Network Controller, and then change the setting to Off.
b. Connect the network cable to the add-in network adapter's connectors. Do not connect the network cable to the integrated connector on the
back panel.
13. Install any drivers required for the card as described in the card documentation.