Dell Precision T3400 (Late 2007) - Manual (Page 261)

Adding and Replacing Parts
261
2 Set the jumpers on the replacement system board so that they are identical
to the ones on the existing board (see "System Board Components" on
page 148).
NOTE:
Some components and connectors on the replacement system board may
be in different locations than the corresponding connectors on the existing system
board.
3 Orient the replacement board by aligning the notches on the bottom of
the board with the tabs on the computer.
4 Slide the system board assembly toward the back of the computer until the
assembly clicks into position.
5 Replace any components and cables that you removed from the system
board.
6 Reconnect all cables to their connectors at the back of the computer.
7 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.
8 Connect your computer and devices to electrical outlets, and turn
them on.
Replacing the Front Panel
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions in the Product Information Guide.
CAUTION:
To guard against electrical shock, always unplug your computer from
the electrical outlet before opening the cover.
NOTICE:
To prevent static damage to components inside your computer, discharge
static electricity from your body before you touch any of your computer’s electronic
components. You can do so by touching an unpainted metal surface on the
computer.
1 Align the notches on the front panel with the corresponding holes on the
front of the computer.
2 Pull the front-panel release lever, and slide the panel to the right to engage
and secure the front panel.