8. Gently press down on the card retention mechanism to secure the adapter bracket in place.9. Close the card retention latch by snapping it into place.10. Replace the computer cover.11. Uninstall the card's driver. See the documentation that came with the card for instructions.12. If you removed a sound card:a. Enter system setup, select Audio Controller, and change the setting to On.b. Connect external audio devices to the audio connectors on the back panel of the computer.13. If you removed an network-adapter card connector:a. Enter system setup, select Network Controller, and change the setting to On.b. Connect the network cable to the integrated network connector on the back panel of the computer.PCI Express CardsYour computer supports one PCI Express x1 card.If you are installing or replacing a PCI Express card, follow the procedures in the next section. If you are removing but not replacing a card, see "Removing aPCI Express Card."If you are replacing a card, uninstall the driver for the existing card. See the documentation that came with the card for instructions.Installing a PCI Express Card1. Follow the procedures in "Before You Begin."1 card fully seated2 card not fully seated3 bracket within slot4 bracket caught outside of slotNOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.