Cpu fan starts and stops repeatedly

[trk_zozy]

Hi, I have setup a new build, left the case panel open, after booting to BIOS I noticed that the cpu fan is starting and stopping repeatedly.
At Smart fan 5 I verified the values, it was switching between 0rpm and 50rpm speeds. After setting to max throttle and restart there was no difference.
I am using the AMD provided stock Wraith stealth cpu cooler. I verified the connections too, tried with one stick of ram, switched it, no difference.
I don't have a GPU because I am planning on using the iGPU of the processor. Haven't touched anything else on the settings except in Smart fan 5.
Today i am going to try with a new psu, current psu is a 420w one, but as far as I calculated I am not using more than 200. The components are new. All components are compatible as far as I know.
The BIOS version is F1, motherboard rev 1.1. I can provide additional information if needed.
Temperatures: the cpu is idling at around 40C, chipset goes up to around 60C, I am not putting it under load as it might damage components.
The question is what could be the problem with the cpu fan speed in this case ?
My setup:
Mobo: GA-AB350M-DS3H
CPU: Ryzen 3 2200g
2xRAM: CMK8GX4M2B3200C16R
PSU: 420W

 

[alexoiu]

Hi, A faulty fan, or a faulty board, I'd say.
Try connecting the CPU fan to a case fan header and a case fan to the CPU fan header. See the result.

 

[trk_zozy]

Hi, A faulty fan, or a faulty board, I'd say.
Try connecting the CPU fan to a case fan header and a case fan to the CPU fan header. See the result.

Thank you for your quick response, good suggestion, but I already tried connecting the cpu fan to a sys fan header, same result. What could this mean ?
I read all types of posts related to this, it can be anything, I have to identify the problem. The bios update solved for some people, changing ram, clearing cmos, cpu pin bent, poor power supply, faulty components. I haven't found mentioning however in other post that they successfully booted to bios and fan does the same when plugged in the sys header. Can i remove the cpu fan from the Stealth cooler heatsink without voiding my warranty ? Cause i am planning on using a different system fan, then replacing the psu then if it's not fixing the problem then i would also check the cpu fan removed from the heatsink.

 

[alexoiu]

"but I already tried connecting the cpu fan to a sys fan header, same result"
Meaning CPU fan pulsing, or the case fan?

 

[trk_zozy]

"but I already tried connecting the cpu fan to a sys fan header, same result"
Meaning CPU fan pulsing, or the case fan?

Cpu fan pulsing

 

[alexoiu]

Then I'd buy an aftermarket one to replace it.

 

[trk_zozy]

I bought a pwm case ventillator, plugged into the sys fan header it was working fine, so as you pointed out it is a faulty cpu fan. I have the warranty for it. Thank you for your time.

 

[alexoiu]

You're welcome.