Question new to pc, issue with mb and ram

Feb 24, 2019
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Hello everyone,
I recently built my first pc and have minimal knowledge on the technical parts of building. I am currently running a MSI-Z370 Tomahwak MB and Corsair-Vengeance LPX 16gb ram. I ran into the issue of one of the ram not reading. When the ram is plugged in the second and fourth slot, my pc doesn't boot up. However, when only one ram is plugged in(3rd slot) or both plugged in (1st and 3rd slot) it starts up. Even if it does start up and go into my setting, only one of the ram is being processed (8gb). Is this an issue of ether the mb or ram being broken? OR Is there any way that I can fix this issue without buying new parts?