Dell OptiPlex 755 - Manual (Page 41)

9. Gently rotate the release tab downward to move the card-retention latch into place to secure the cards.
10. Connect any cables that should be attached to the card.
11. Replace the computer cover (see Replacing the Computer Cover ), reconnect the computer and devices to electrical outlets, and then turn them on.
12. If you installed a sound card:
a. Enter system setup, select Audio Controller, and change the setting to Off (see Entering System Setup ).
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 or front panel.
13. If you installed a network adapter card and want to turn off the integrated network adapter:
a. Enter system setup, select Network Controller, and change the setting to Off (see Entering System Setup ).
b. Connect the network cable to the connector on the network adapter card. Do not connect the network cable to the integrated network connector
1 card fully seated
2 card not fully seated
3 bracket within slot
4 bracket caught outside of slot
NOTE: If you are installing a PCI Express x16 card, ensure that the securing tab on the connector's release lever fits into the notch on the front
end of the card.
1 release tab 4 card-edge connector
2 card-retention latch 5 card connector
3 card
NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer cover from closing properly or
cause damage to the equipment.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.