CPU Fan does not reduce RPM anymore

Hey there,

I just got my new computer for a month and as of today the CPU fan does not reduce its speed anymore. I just goes high/full throttle.  

Anyways, I went to the BIOS and checked what "CPU SMART Fan Control" was set to, and it was "Normal". I tried Silent but still it goes on at a high throttle. I tried the SpeedFan program but couldnt get any better results.



Any idea whats causing the problem?
- Gigabyte GA-Z68XP-UD3, Z68 (dual PC3-10667U DDR3)
- Thermalright HR-02 Macho AMD und Intel