I have the CoolerMaster hyper 212 evo. I'm not sure if its a power saving thing or not but sometimes the fan just doesn't spin. No over heating issues yet. But its starting to concern me. I checked Bios, their is no setting or anything to make it wait till a certain temp. Is the fan going out? Should it always be 100% spinning? For instance I just booted my PC 2 minutes ago came to this forum and wrote this and the fan is still idle.