Asus Prime X470-Pro cant find cpu fan

H3RBSKI · 26 Dec 2019 at 20:36

as the title says, pc has been working great until today when i changed the case. everything was removed asif it was a brain transplant so made sure nothing was knocked or bent etc. After building and plugging everything back in on my first boot i got several beeps from the mobo with "cpu fan error" on the boot screen. Booted to bios and it says it cant find the cpu fan but finds my AIO pump and all chassis fans.
Tried re seating it and even trying the cpu fan optional pins but still gives me the same error.
The fans work fine from what i can tell as after running cinibench for a few runs im maxing out at 60°c which is what i was hitting before the case swap.
should i be worried? anything i can check that i may be over looking?

ANDARIAL · 27 Dec 2019 at 09:08

cpu fan speed wire is broken or not in the plug far enough is what it sounds like
Have a look at the plug on the fan

H3RBSKI · 27 Dec 2019 at 14:04

i did check the plug out when i switched ports and all seems ok. will take another look later though or see if i can get a replacement wire from thermal take. as everything else seems fine. leds work and so do fans just the mobo doesnt seem to think it exists

Tetras · 28 Dec 2019 at 17:56

There's not some kind of detection delay that was set before and lost in the swap, right?

hominid · 28 Dec 2019 at 19:13

Switch the fan to DC instead of PWM.

H3RBSKI · 28 Dec 2019 at 20:52

hominid said:
Switch the fan to DC instead of PWM.

How do I do that? Took it apart again and checked all the wires. They are all seated fine still same issue. If I set the cpu fan monitor to "ignore" in the bios it works fine without any errors thrown up.