Question CPU Fan Error... most of the time

kag

Golden Member
May 21, 2001
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I have a brand new Cooler Master 212 that returns a CPU Fan Error and will not spin. It shows up at N/A in the BIOS.

Well, most of the time (more at the end).

I tried the other fan headers on my brand new Asus Tuf Gaming B500M-Plus and it will not spin in any of them.

I used another fan to test all fan headers and they all work fine.

I assumed my Cooler Master 212 was dead, but I plugged in into my old motherboard and it worked fine.

I don't understand what's going on, it doesn't make sense.

I updated the BIOS on the new motherboard, but no change. I'm not familiar with Asus Q-Fan, but here are the CPU fan settings:
  • CPU Q-Fan Control: PWM Mode
  • CPU Fan Step Up: 0 sec
  • CPU Fan Step Down: 0 sec
  • CPU Fan Speed Lower Limit: 600 RPM (as per Cooler Master specs)
  • CPU Fan Profile: Standard
After some trial and error, the fan started spinning and was detected. I'm not sure exactly what I did, but I was playing with the power and and reset buttons.

I used the computer for an hour or two and turned it off. The next time I turned it back on, the fan wasn't detected anymore.

I played with the power and reset buttons again and got it working after a few tries, but I haven't been able to identify the exact sequence.

Any idea what's going on? Thank you in advance!