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AcidAddict33

Noctua fan issue or Motherboard issue?

I tried messing with the fan settings with no success; The only way I've been able to use my pc right now is to disable the CPU minimum fan speed check, and to plug it into the pump header which causes it to spin at max speed.

 

However I just solved the problem. With a Bios update. I don't even know how that would even work, but it did. I just upgraded my rig today, and I thought I had updated to the latest BIOS via flashdrive but turns out I hadn't, so I just did that and all of a sudden my CPU fans started kicking in. Did not realize that a BIOS update could affect fans but I guess it kind of makes sense since my old fan that's almost 6 years old worked and the newer ones didn't. Anyways I'll marked this as solved now.

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Posted · Original PosterOP

Motherboard: Asus ROG Crosshair Hero VII WIFI

CPU Cooler: Noctua U12A

 

I've recently upgraded my rig and everything seems to be working fine, except the CPU fans. I've plugged them into the correct CPU fan headers on the motherboard, but they simply do not turn on. However, if one of the fans is not pushed in all the way and is at a specific angle, then it works. But the slightest nudge unplugs it.

 

I tried the stock cooler fan (for the Ryzen 3700x) and it has the same issue.

 

Out of curiosity I dug out my old cpu fan and it works completely fine when plugged all the way in. I figured if it's sometimes working then the pins themselves are fine, and then I noticed the holes on the old fan (white) are way smaller than the Noctua ones (black). Are the bigger holes preventing the pins from making contact with the wires? And if so, is this a common issue with Noctua fans, and how do I solve it? Or am I completely off base with what the problem is?

 

1907552843_coolermasterfan.jpg.2caa62f6e08477d0e833f65ae2d59894.jpg1131436334_noctuafan.thumb.jpg.7a83c59b09cce28df3c59ce9f7a2d4a6.jpg

 

 

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Have you enabled PWM through your BIOS? Still seems unlikely that they would not spin at all but worth checking in too. I have the same motherboard and I have used Noctua NF and Corsair ML fans, connectors were never an issue. 


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If you got 2 different models of fans that don't work (Stock cooler and Noctua) and 1 fan that doesn't (previous CPU cooler), I'm gonna go out on a limb here and say there is something weird with the latter. It might have damaged the pins on your board. I have 6 fans from Noctua and none of them have this issue.

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This sounds like the fan running when the PWM pin isn't connnected.

Then when you plug it in properly the PWM pin is connected and the fan stops because it's getting low PWM signal.

Maybe check your motherboard's fan control settings in the BIOS or software.


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Posted · Original PosterOP · Best Answer

I tried messing with the fan settings with no success; The only way I've been able to use my pc right now is to disable the CPU minimum fan speed check, and to plug it into the pump header which causes it to spin at max speed.

 

However I just solved the problem. With a Bios update. I don't even know how that would even work, but it did. I just upgraded my rig today, and I thought I had updated to the latest BIOS via flashdrive but turns out I hadn't, so I just did that and all of a sudden my CPU fans started kicking in. Did not realize that a BIOS update could affect fans but I guess it kind of makes sense since my old fan that's almost 6 years old worked and the newer ones didn't. Anyways I'll marked this as solved now.

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