Hi! Last week I built my first PC. I was a bit nervous about accidentally breaking parts, but it actually went quite well. The only thing it was missing, was an operating system, so earlier today I installed Windows 10 to my SSD. After about half a minute I realized that one of the fans was making a lot of noise. Not long after Windows had succesfully booted, the GPU's fans automatically turned off because it wasn't being used. That's when I knew the sound was coming from the CPU cooler, the Wraith Stealth. I immediately downloaded NZXT's Cam software to try and figure out what was going on. Apparently the fan was spinning at ~1660 RPM (which is its max speed according to Cam) despite the fact that it wasn't under any load.
What could be the reason for this and how do I fix it?
Also, I don't know if this has anything to do with the fan spinning so fast, but it's making a strange noise. Here's the audio, you have to turn the volume up high to hear it though: https://vocaroo.com/i/s0N03jtk7Men