Dell XPS /Dimension Gen 2 Service Manual page 13

CAUTION: Some network adapters automatically start the computer when they are connected to a network. To guard against electrical shock, be
sure to unplug your computer from its electrical outlet before installing any cards.
8. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.
If the card is full-length, insert the end of the card into the card guide bracket as you lower the card toward its connector on the system board. Insert
the card firmly into the card connector on the system board.
9. 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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10. 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.
11. Connect any cables that should be attached to the card.
See the documentation for the card for information about the card's cable connections.
12. Close the computer cover.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
13. Connect your computer and devices to electrical outlets, and then turn them on.
14. Install any drivers required for the card as described in the card documentation.