Do you have a folder named "AsusFanControlService" inside the "Asus" folder, on program files? Look at Administrative Tools, Services, for the path to executable.
I had a problem like this, and I fix it this way. If you don't have this folder, create, and copy the folder content from "Fan Xpert 2" from your Asus AI SUITE II installation folder (extracted) and check if the path to the executable is right.
Then confirm if the service is running, on the Administrative Tools.
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