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CPU fan randomly speeds up during boot

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  • Components
Last response: in Components
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January 9, 2014 11:28:09 AM

Hello, I have a cooler master evo 212 CPU cooler and a GA-Z87-HD3 motherboard. My problem is that it randomly speeds up when I turn on my computer. For weeks it stopped, then it started going fast again, and to stop it from running I have to turn my PC on and off at least 3 times.

I've tried setting the fan in the BIOS to run manually to try and use it in Speedfan, I've however had no success in doing so.

No, my PC is NOT overheating at all, the temps are completely fine, around 30C I just need to know how to stop my fan being obnoxiously loud when I start up my PC. It doesn't stop being loud at all after 5 mins, it just keeps going fast when it doesn't need to.

My guess is that I'll need a BIOS update as this is most likely a bug with it?

More about : cpu fan randomly speeds boot

January 9, 2014 12:18:52 PM

You can't do anything as the fan controls itself
January 9, 2014 12:26:24 PM

Could be a BIOS update will cure the problem. Could also be that the MB has a defective PWM fan control.
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February 2, 2014 1:14:36 PM

(Sorry to bump) It wasn't my CPU fan. It was my rear fan making all the noise... The only way I can stop it from being loud is by flicking the switch on it from high to med/low, or putting my finger on the middle of it.

It's about a little over 3 years old the case and the fan itself so I'm guessing it's dying or it doesn't like my motherboard.

When it made all the noise it would become extremely hot, to the point where I could only hold my finger on it for 6 seconds because it was that hot...
February 2, 2014 1:20:30 PM

It could be that the RPM sensor on it is getting wonky and the motherboard is just doing the best it can. Or it could be one of the types that has a small thermistor on the back that allows it to self-control its speed, and that circuitry has failed (Dells used those for years and they sucked).
February 2, 2014 1:20:50 PM

Sounds like you found the problem Just replace the rear fan. If holding your finger on the center of the spinning fan stops the noise, it may be the tiny bearing is wore out.
February 3, 2014 9:19:17 AM

Fan is now replaced, it was almost impossible to put the screws into the fan... They're not 100% in but I'm sure the fan wont go anywhere seeing as I moved it in a lot of ways...

Thanks for all the help people!
February 3, 2014 10:58:02 AM

KLED said:
Fan is now replaced, it was almost impossible to put the screws into the fan... They're not 100% in but I'm sure the fan wont go anywhere seeing as I moved it in a lot of ways...

Thanks for all the help people!


If the fan mounting uses the typical self-threading screws that cut their own threads into the plastic holes in the fan frame, you need a really stout, good quality Phillips (cross-headed) screwdriver. I like to pre-turn the screws all the way into the holes and back out before placing the fan into position. Once the threads are initially cut, they turn in much easier after that.
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