Dell OptiPlex 755 User's Guide - Page 110

see Entering System, If you removed a sound card - network drivers

Page 110 highlights

3 2 1 4 5 1 PCI Express x16 card 2 release lever 3 securing slot (not all cards) 4 securing tab 5 PCI Express x16 card connector 6 Grasp the card by its top corners, and ease it out of its connector. 7 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 maintain the airflow that cools your computer. 8 Rotate the release tab downward to snap the card-retention latch into place. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 9 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. 10 Uninstall the card's driver. See the documentation that came with the card for instructions. 11 If you removed a sound card: a Enter system setup, select Audio Controller, and change the setting to On (see "Entering System Setup" on page 280). b Connect external audio devices to the audio connectors on the computer back panel. 110 Expansion Cards

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110
Expansion Cards
6
Grasp the card by its top corners, and ease it out of its connector.
7
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 maintain the airflow that cools your
computer.
8
Rotate the release tab downward to snap the card-retention latch into place.
NOTICE:
To connect a network cable, first plug the cable into the network wall jack and then plug it into the
computer.
9
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.
10
Uninstall the card’s driver. See the documentation that came with the card for instructions.
11
If you removed a sound card:
a
Enter system setup, select
Audio Controller
, and change the setting to
On
(see "Entering System
Setup" on page 280).
b
Connect external audio devices to the audio connectors on the computer back panel.
1
PCI Express x16 card
2
release lever
3
securing slot (not all cards)
4
securing tab
5
PCI Express x16 card connector
3
2
1
5
4