10. If you replaced a card that was already installed in the computer and you removed the retention mechanism, you may reinstall the retention mechanism.
11. Before replacing the card retention mechanism, ensure that:
l The tops of all cards and filler brackets are flush with the alignment bar.
l The notch in the top of the card or filler bracket fits around the alignment guide.
12. Snap the card retention mechanism into place, securing the card.
13. Replace the computer cover, (see Replacing the Computer Cover), reconnect the computer and devices to electrical outlets, and then turn them on.
14. If you installed a sound card:
a. Enter system setup (see Entering 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.
15. If you installed a network adapter card and want to disable the integrated network adapter:
a. Enter system setup (see Entering System Setup), select Network Controller, and then change the setting to Off.
b. Connect the network cable to the network adapter card. Do not connect the network cable to the integrated connector on the back panel.
16. Install any drivers required for the card as described in the card documentation.