Dell Alienware m18 R2 Owner's Manual page 79

Steps
1. Turn the system board over.
2. Install the heat-sink assembly.
3. Install the audio board.
4. Turn the system-board assembly over.
5. Using the alignment posts, place the system-board assembly on the palm-rest and keyboard assembly.
6. Replace the twelve screws (M2x4) that secure the system board to the palm-rest and keyboard assembly.
7. Tighten the captive screw (M2x6) that connects the left fan to the palm-rest and keyboard assembly.
8. Replace the three screws (M2x3) that secures the audio board to the palm-rest and keyboard assembly.
79