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The pin outputs on the board marked as xxx_Fan are simply fan power headers, they will not all necessarily have something attached.
It sounds possibly as if the CPU fan is catching on something if it's THAT loud - even at full speed the Alpenfohn would be more of a whine/whoosh than a grinding sound.
With the power disconnected, see if you can manually spin the fans in your computer - try both the CPU and case fans and see if they are spinning freely without noise
It sounds possibly as if the CPU fan is catching on something if it's THAT loud - even at full speed the Alpenfohn would be more of a whine/whoosh than a grinding sound.
With the power disconnected, see if you can manually spin the fans in your computer - try both the CPU and case fans and see if they are spinning freely without noise