Alienware Aurora R13 Service Manual page 36

Steps
1. Lay the computer on the right side.
2. Place the power-supply unit on the chassis.
3. Align the screw holes on the power-supply unit with the screw holes on the chassis.
4. Replace the four screws (#6-32x1/4") that secure the power-supply unit to the chassis.
5. Place the power-supply unit bracket on the power-supply unit.
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