11. Snap the card retention mechanism into place, securing the x16 PCI card.12. Replace the computer cover, reconnect the computer and devices to electrical outlets, and then turn them on.13. 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.14. 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 theback panel.15. Install any drivers required for the card as described in the card documentation.Removing a PCI Express Card1. Follow the procedures in "Before you Begin."2. Gently push the release tab on the card retention door from the inside to pivot the door open. Because the door is captive, it will remain in the openposition.3. If your computer includes a card retention mechanism, to secure the x16 card in place from the top:a. Pivot the mechanism upward and gently squeeze in on the sides to release the mechanism from the two tab slots holding it in place.b. Set the retention mechanism aside in a secure location.4. If you are removing the card permanently, install a filler bracket in the empty card-slot opening.If you need a filler bracket, contact Dell.1 card retention door2 card retention mechanism3 release tabs (2)NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer cover from closing properly orcause damage to the equipment.NOTICE: To connect a network cable, first plug the cable into the network device and then plug the cable into the computer.NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the computer. The brackets also keep dustand dirt out of your computer.