CPU Fan problem

So my cpu fan starts and then stops repeatedly and then moments later my pc shuts off. How can I fix that

Go into the BIOS and check for fan settings there, also look for a "Hardware Monitor" entry and check the fan there. If you change any settings be sure to hit "Save and Exit", then it will restart.

From Windows - Grab HWINFO here and install it to monitor the fans. You can also watch the CPU voltage and temps (see image) and let us know how it's going.

HWINFO.jpg
 
If that doesn't work, need some details:
1 - age & model for motherboard, RAM & PSU?
2 - recent hardware changes?
3 - recent environment changes (I.e., moved to Mongolia by yak, etc)?
4 - recent software changes?
5 - any error codes / beep codes?
 
Check Bios and try find It who can help , because from small problem can be bigger if u re not sure if can u fix this or that or not.
 
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