2. Loosen 3 P1 captive screws (1) on the fan, remove 4 M2x3L P1 screws (2) from the system board, and 
remove 2 M2x3L screws from the ODD board (3).
3. Lift the system board (4), and then remove it (5).
Reverse this procedure to install the system board.
58 Chapter 5   Removal and replacement procedures for Authorized Service Provider parts