MSI B85M-G43 - Manual (Page 24)

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Important
Confirm that the CPU heatsink has formed a tight seal with the CPU before booting
your system.
Whenever the CPU is not installed, always protect the CPU socket pins by covering
the socket with the plastic cap.
If you purchased a separate CPU and heatsink/ cooler, Please refer to the
documentation in the heatsink/ cooler package for more details about installation.
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7. Locate the CPU fan connector on the motherboard.
8. Place the heatsink on the motherboard with the fan’s cable facing towards the fan
connector and the fasteners matching the holes on the motherboard.
CPU fan connector
9. Push down the heatsink until the four fasteners get wedged into the holes on
the motherboard. Press the four fasteners down to fasten the heatsink. As each
fastener locks into position a click should be heard.
10. Inspect the motherboard to ensure that the fastener-ends have been properly
locked in place.
11. Finally, attach the CPU fan cable to the CPU fan connector on the motherboard.
Motherboard
Fastener-end