Dell OptiPlex 170L - Manual (Page 81)

7. Lower the retention arm and press it into place.
8. Replace the card cage (see step 3 of the previous procedure).
9. Close the computer cover, reconnect the computer and devices to electrical outlets, and turn them on.
10. Remove the card's driver from the operating system.
11. 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 computer back panel.
12. If you removed an add-in network connector:
a. Enter system setup, select Network Controller, and change the setting to On.
b. Connect the network cable to the integrated connector on the computer back panel.
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NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug the cable into the computer.