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CPU fan runs at full speed, but only once Windows starts.

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#1 skyhawk214


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Posted 30 June 2016 - 03:55 PM

This happened completely out of nowhere today, my CPU fan just got really loud. It runs fine during the POST and while Windows loads, but once it gets to the login screen, it goes to full speed and stays there.

I checked the temperature and its 22 degrees C right now. 


I'm running an AMD FX8320 8 core CPU, A Asus Crosshair V Formula Z, Windows 10 and the CPU fan is a Zalman CNPS9700. 


I have the fan setting in the BIOS set to "DC" instead of "PWM" because this cpu fan only has three pins.


What could be the problem?


Thanks guys, hope to hear back soon. 


IMPORTANT EDIT: I found something out when I took the side panel off my case. One fan on my Geforce GTX760 wasn't spinning. It would act like it was trying to turn on but wasn't. Could this be the culprit of the issue?


Perhaps I'm mis-hearing the sound. Maybe its the working GPU fan that's spinning really quickly to compensate for the non functioning fan. Does that make sense? 



Edited by skyhawk214, 30 June 2016 - 05:06 PM.

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#2 skyhawk214

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Posted 30 June 2016 - 05:10 PM

That was it, the problem is my GPU, it was the first fan that was making so much noise. Thanks for the help everyone! Case closed!

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