Fan Running Too Fast And Loud

When I launched my stationary PC this morning, there were some books on the keyboard so it started beeping, I don't know which buttons the books were on and my fans started running so fast and extremely loud.
My pc have 3 fans, 2 of them are running on 3XXX RPM and the other one on 5XXX RPM (https://image.ibb.co/jYAjYw/fan.png), I tried to slow them by using speedfan but it didn't work.

Anyone knows what's wrong?

Thanks!
 
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