I'm not sure as to why my H100i started making noises. It happened as I was playing heavy modded Skyrim. It just started being noisy for some reason. It got annoying so I just turned my system off. But then I tried to find a fix for it and found none. Even when the fans are turned off, it still makes the noise. It sounds like it's coming from the block, but who knows. It's just irritating. Here's the vid by the way: [video="https://www.youtube.com/watch?v=kG0-O-YZZdI"][/video]