Just recently got a new case (Air 540) which obviously allows noise to leak through. I'm trying to isolate where a "whirring" noise is coming from (no, it doesn't sound like a normal fan noise). I've already isolated the PSU by stopping the fan blades from moving and the noise still persists, so I think that it may be my heatsink (Noctua NH-D14). Is it safe to unplug the fans on my heatsink for around 1-2 minutes just to see if the noise goes away? Will an excess of heat build up in that short period?