2. Position the new heat-sink-and-fan assembly on the system board. Ensure that the four screws arealigned with the holes in the system board. Follow the following sequence to tighten the four screws tosecure the new heat-sink-and-fan assembly to the system board. Do not over-tighten the screws. Then,install the four screws to secure the new heat-sink-and-fan assembly to the chassis.• Partially tighten screw 2a , fully tighten screw 2b , and then fully tighten screw 2a .• Partially tighten screw 2c , fully tighten screw 2d , and then fully tighten screw 2c .Notes:• Apply appropriate amount of thermal grease to the new heat-sink-and-fan assembly.• In case you need to install the chassis beam as well, ensure that it has been installed in place beforeyou install the 125-watt heat-sink-and-fan assembly.66 P360 Tower User Guide