Dell Precision 490 - Manual (Page 139)

Replacing the System Board
1. Transfer components from the existing system board to the replacement system board:
a. Remove the memory modules and install them on the replacement board. See Memory for more information.
b. Remove the processor from the existing system board and transfer the processor to the replacement system board. See 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 screw holes in the board with the corresponding holes in the computer chassis.
4. Screw in the 9 screws that attach the system board.
5. Replace the heat sink assembly and tighten the four captive screws to secure it to the system board.
6. Replace any components and cables that you removed from the system board.
7. Reconnect all cables to their connectors at the back of the computer.
8. Replace the computer cover (see Replacing the Computer Cover ).
9. Connect your computer and devices to electrical outlets, and turn them on.
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CAUTION: The processor package and heat-sink assembly can get hot. To avoid burns, ensure that the package and assembly have had sufficient
time to cool before you touch them.
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.