Dell OptiPlex 740 - Manual (Page 100)

a. Enter system setup, select Integrated Audio from the Onboard Devices group, and change the setting to Off (see System Setup ).
b. Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the line-in connector on the back panel
of the computer (see Back-Panel Connectors ).
10. If you installed a network adapter card and want to turn off the integrated network adapter:
a. Enter system setup, select Integrated NIC from the Onboard Devices group, and change the setting to Off (see System Setup ).
b. Connect the network cable to the network adapter card's connectors. Do not connect the network cable to the integrated network connector on
the back panel of the computer.
11. Install any drivers required for the card as described in the card documentation.
Removing PCI Express x16 Cards and DVI-Cards
1. Follow the procedures in Before You Begin .
2. Gently lift the release tab on the card retention latch from the inside to pivot the latch open. Pivot the latch until it snaps into the open position.
3. If necessary, disconnect any cables connected to the card.
4. Press the lever with your thumb until you release the securing tab.
If you are removing a PCI Express x16 card, go to step 5 .
If you are removing a DVI-card, go to step 6
5. While pressing the lever, pull the card up and out of the card connector.
6. While pressing the lever, pull the removal pull tab up and remove the card out of the card connector.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
1 PCI Express x16 card 2 lever 3 securing slot
4 securing tab 5 PCI Express x16 card connector