8. Remove the eight screws that secure the system board.
Figure 114. Removing the eight screws that secure the system board
9. Lift the system board out of the chassis.
10. Remove the microprocessor from the failing system board and install it on the new system board. See
“Replacing the microprocessor” on page 166.
11. Install the new system board into the chassis by aligning the eight mounting studs in the chassis with the
corresponding holes in the new system board. Then, install the eight screws to secure the system board.
12. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new
system board. See “Replacing the heat sink and fan assembly” on page 158.
13. Install all memory modules and PCI cards removed from the failing system board on the new system
board. See “Installing or replacing a memory module” on page 139 and “Installing or replacing a PCI
card” on page 141.
14. Reconnect all remaining cables to the system board. See “Locating parts on the system board”
on page 77.
15. Lower the optical drive bay assembly.
16. To complete the replacement, go to “Completing the parts replacement” on page 187.
Replacing the cover presence switch
Attention:
Do not open your computer or attempt any repair before reading and understanding “Important safety information”
on page 1.
This section provides instructions on how to replace the cover presence switch (intrusion switch).
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