a. Enter system setup, select Integrated Devices, and change the setting for Sound 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 (for the Dell Precision 450 computer, see "Back View" or for the Dell Precision 650 computer, see "BackView").11. If you installed an add-in network connector:a. Enter system setup, select Integrated Devices, and change the setting for Network Interface Card to Off.b. Connect the network cable to the add-in network connector's connectors. Do not connect the network cable to the integrated connector on theback panel.12. Install any drivers required for the card as described in the card documentation.Removing a Card1. Press the lever on the card retention arm and raise the retention arm (see "Installing a Card").2. If you are removing an AGP card, press out on the release tabs and pull the AGP card guide up and off of the base.3. If necessary, disconnect any cables connected to the card.4. Grasp the card by its top corners, and ease it out of its connector.5. 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.6. Lower the retention arm and press it into place, securing the card(s) in the computer.7. Close the computer cover, reconnect the computer and devices to electrical outlets, and turn them on.8. Remove the card's driver from the operating system.9. If you removed a sound card:a. Enter system setup, select Integrated Devices, and change the setting for Sound to On.CAUTION: Before you perform this procedure, follow the safety instructions in the System Information Guide.1 base2 release tabs (2)3 AGP retention springNOTE: 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.NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.