Dell Precision T3400 (Late 2007) - Manual (Page 168)

168
Adding and Replacing Parts
9 Replace the computer cover, (see "Replacing the Computer Cover" on
page 262).
NOTICE:
To connect a network cable, first plug the cable into the network port or
device and then plug it into the computer.
10 Connect your computer and devices to electrical outlets, and then turn
them on.
11 Uninstall the driver for the removed card. See the documentation that
came with the card.
12 Update System Setup settings, as needed.
If you removed a sound card, enter System Setup (see "Entering System
Setup" on page 81), select Integrated Audio, and then change the setting
to On.
1 card retention door 2 release tab
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