MSI P1-109N-L70 - Manual (Page 43)

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Hardware Setup
10. Place the heatsink on top of the CPU and secure the screws on both sides.
6. After confirming the CPU direction (indicated below with red circles) for correct
mating, put down the CPU in the socket housing frame. Note that the alignment
keys are matched.
7. Visually inspect if the CPU is seated well into the socket. If not, take out the CPU
with pure vertical motion and reinstall.
8. Cover the load plate onto the package.
9. Press down the load lever lightly onto the load plate and then secure the lever
with the hook under the retention tab.
Yellow triangle is the Pin 1 indicator
Alignment Key
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