17. Lower the microprocessor straight down into the system board socket of the
new system board.
18. Tosecure the microprocessor in the socket, close the microprocessor retainer
and lock it into position with the small handle.
19. Install the new retention module (if required) on the new system board.
20. Install the heat sink and fan assembly on the system board.
21. Connect the heat sink and fan assembly cable to the new system board. See
the system board illustration for your machine type at “System board
connectors” on page 116.
22. Install the new system board into the chassis and align the screw holes with
those in the chassis. Insert and tighten the screws that secure the system
board.
23. Pivot the hard disk drive back into position.
24. Connect the power and signal cables to the hard disk drive.
25. Connect all cables to the system board. See the system board illustration for
your machine type at “System board connectors” on page 116.
26. Go to “Completing the FRU replacement” on page 147.
Chapter9. Replacing FRUs - Tower Computers 123