Dell Precision 690 - Manual (Page 134)

b. Remove any installed heat-sink assemblies and processors from the existing system board and transfer them to the replacement system board.
See Removing the Processor for more information.
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 .)
3. Orient the replacement board by aligning the slots on the bottom of the system board pan with the tabs on the chassis.
Slide the system board into place.
4. Screw the system board assembly into place.
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 ).
8. Connect your computer and devices to electrical outlets, and turn them on.
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NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the
existing system board.
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.