I'm using a NZXT Sentry 3 PC Case Fan controler, it's not connected to the motherboard, just powered by the PSU.
https://www.nzxt.com/products/sentry-3
My build worked fine for 3 years, suddenly it stop booting, I've decided to troubleshoot the problem, I've setup the motherboard on a cardboard box and added components one by one, restarting in between. I was able to connect everything back and have it working again. I proceed to reassemble...