Dell OptiPlex 755 User's Guide - Page 46
Audio Controller - sound driver
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2 1 3 4 5 6 1 card retention latch 4 card-edge connector 2 alignment guide 5 card connector 3 card 6 release tab 4 If necessary, disconnect any cables connected to the card. 5 If you are removing the card permanently, install a filler bracket in the empty card-slot opening. NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the computer. The brackets keep dust and dirt out of your computer and maintains the airflow that cools your computer. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 6 Replace the computer cover (see "Replacing the Computer Cover" on page 317), reconnect the computer and devices to electrical outlets, and then turn them on. 7 Uninstall the card's driver. See the documentation that came with the card for instructions. 8 If you removed a sound card: a Enter system setup, select Audio Controller, and change the setting to On (see "System Setup" on page 280). b Connect external audio devices to the audio connectors on the back panel of the computer. 46 Cards