16. Holding the microprocessor with your fingers, position the microprocessor so
that the small triangle1 on one corner is aligned with the corresponding
triangle on the socket.
17. Make sure that the small handle is in the raised position.
18. Lower the microprocessor straight down into the system board socket of the
new system board.
19. Lower and latch the handle to secure the microprocessor in the socket.
20. Install the retention module that was removed from the rear of the failing
system board on the new system board.
21. Install the heat sink and fan assembly on the new system board.
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. Connect all cables to the system board. See “Identifying parts on the system
board” on page 116.
24. Replace the hard disk drive. See “Replacing the hard disk drive” on page 140.
25. Install the drive bay assembly and connect the power and signal cables to the
drives.
26. Reinstall any PCI adapter cards that were removed. See “Replacing a PCI
adapter” on page 121.
27. Position the fan duct on the heat sink fan.
28. Go to “Completing the FRU replacement” on page 144.

Chapter 9. Replacing FRUs (Types 7390, 7391, 7392, 7396, 7397, and 7398) 131