Dell OptiPlex 170L - Manual (Page 70)

8. Remove the screws that secure the system board to the computer frame.
Four of the screws that secure the system board to the computer frame also secure the heat-sink base to the system board.
9. Lift the system board out of the computer.
10. Place the system board that you just removed next to the replacement system board.
Visually compare the replacement system board to the existing system board to ensure that you have the correct part.
11. Transfer components from the existing system board to the replacement system board:
a. Remove the memory modules and install them on the replacement board.
b. Remove the processor from the existing system board and transfer the processor to the replacement system board.
12. Configure the settings of the replacement system board.
Set the jumpers on the replacement system board so that they are identical to the ones on the existing board.
13. Place the system board inside the computer frame, place the heat-sink base on the system board, and then replace the screws that you removed in
step 8 .
14. Reinstall the processor heat sink.
15. Reinstall the heat sink shroud and lower the shroud over the heat sink.
16. Reattach the cables to the system board.
17. Reinstall any cards.
18. Replace the floppy drive, if used.
19. Replace the computer cover.
20. Connect your computer and devices to electrical outlets, and turn them on.
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CAUTION: The processor can get hot. To avoid burns, ensure that the processor has had sufficient time to cool before you touch it.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug the cable into the computer.