CPU Fan goes crazy when in normal mode

Jul 24, 2018
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Hi, I have an Fujitsu LifeBook AH531 and everything was normal, but one day my fan started going crazy, in my BIOS I have an option for my CPU fan speed to be "Quiet" or "Normal" and when it's set to Quiet everything is ok, but when I set it to Normal, after a few minutes the fan starts to make weird noise. I removed the fan and put it back, tightened every screw, reset the BIOS, but nothing worked.
 
Jul 24, 2018
2
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10
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I replaced the fan with a spare one and this time the fan was running normal, maybe there was something wrong with the old fan, since I have it from the day I bought this laptop around 2012.
 
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