3. Disconnect the optical-drive data cable from the system board.
4. Disconnect the power-supply unit cable from the system board.
5. Disconnect the hard-drive data cable from the system board.
6. Disconnect the hard drive and optical-drive power cable from the system board.
7. Disconnect the power-button module from the system board.
8. Disconnect the processor power-cable from the system board and remove the processor power-cable from the routing guides on the
chassis.
9. Remove the six screws (#6-32x6.35) that secure the system board to the chassis.
10. Slide and lift the system board at an angle to remove it from the chassis.
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Removing the system board