One of the more likely hardware causes is the PWM wire of the 4 pin connection (assuming you have 4 pin PWM fans) has broken somewhere. Check the software thoroughly before going beyond a simple visual inspection of the hardware. It also shouldn't hurt to run the auto fan tuning in both the BIOS and Fan Xpert, in case the configs have somehow become corrupted. That's based on the AI Suite variant of Fan Xpert if you have the Armory Crate variant, there should be similar settings (but I can't see them, as ASUS don't allow me to get the AC variant on my motherboard). If they do react there, it's a software type problem (which could include the BIOS fan config). In Fan Xpert, you should be able to change from "Smart Mode" (which uses the fan curve) to "RPM Fix Mode", and vary the RPM setting manually to see if the fans react to that. The first thing is to confirm there's no software control.
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