SpyderTracks
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Could you upload a photo of the case controller as currently we're shooting in the dark without knowing what's plugged in where?Sorry I did actually say that the front fans are connected to the 3 pin headers on the case controller. I've posted a lot and sounds like you are really busy so no worries if you missed that bit.
So where we are is all 3 fans are connected to the nexus hub. The nexus hub is connected via the PWM header to the CHA_FAN5. Changing the CHA_FAN5 speed via the BIOS (or any other fan channel for that matter) doesn't have any effect in AUTO mode, DC mode or PWM mode. Turning the fans off doesn't turn them off either.