I have posted this thread before, but never got a real answer. I upgraded my build to Coffee Lake a few months ago, I previously had a Haswell CPU, so I had to upgrade the Mobo, and ram, while installing the memory, I thought I had read that you had to install the dimms side by side to get dual channel speeds, which struck me as odd. A few months later, I was reading the installation guide again, and realized that it DID in fact say to configure them in ever other slot. I immediately wanted to fix this. However, when I configured the dimms correctly, the PC wouldn't post. I tested the dimms individually, and they both function properly, and when I go into the BIOS it says that there are 16gbs of memory. So I figured it was some sort of manufacturer issue. I was wondering if I could get a refund on the memory modules this late into buying them for a defect. Does anyone know if that's possible? Thanks