Second DIMM slot won't recognize RAM on new build. Please Help!

Alex_1996

Prominent
Feb 19, 2017
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So I just built a new pc and when I enter the BIOS the second DIMM slot is listed as being empty despite being occupied by a second RAM stick (the first slot doesn't have this issue). I have tried switching up the RAM and cleaning both the slot and the sticks to no avail. I'm hoping there is another solution other than giving up and RMAing the motherboard. Here is my core setup for anyone interested.

CPU: Intel Core i5 6500 (3.2 GHz)
Motherboard: MSI B150i Gaming Pro AC (mITX)
RAM: 16GB (2x8GB) Corsair Vengeance LPX DDR4-2666
PSU: Corsair CX550M 80+ Bronze semi-modular Power Supply