Dell Precision T3400 (Late 2007) - Manual (Page 179)

Adding and Replacing Parts
179
13 Update System Setup settings, as needed.
If you removed a sound card, enter System Setup (see "Entering System
Setup" on page 81), select Integrated Controller, and then change the
setting to On.
If you removed a network adapter card, enter System Setup (see "Entering
System Setup" on page 81), select Integrated NIC, and then change the
setting to On.
NOTE:
Connect your external audio devices or your network cable to the
audio and network connectors on the back panel of the computer.
Installing a PCI Express Card
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions in the Product Information Guide.
1 Follow the procedures in "Before You Begin" on page 143.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 145).
3 Press the release tabs on the card retention door and pivot the door open.
4 Remove the screw in the alignment bar.