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CPU fan spins up momentarily, then stops and BIOS reports error

Last response: in CPUs
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November 2, 2013 1:57:29 AM

My fan was working correctly a few days ago. Today, I powered up my computer but the CPU fan was not spinning. The BIOS did not report any errors, though it reported the CPU fan RPM as zero. I opened up my case and tried to boot. The fan spins up momentarily, but stops spinning after the POST beep. The BIOS still did not report any error, even though it was configured to do so. I decided to ignore the problem and booted up again. This time, the fan spinned up momentarily, stopped after the POST beep, and the BIOS reported an error with the CPU fan and refused to boot. How do I solve this? I really don't want to replace the fan because it would take at least 3 weeks for a spare to arrive.
a b à CPUs
November 2, 2013 2:25:23 AM

got another fan header on the motherboard?

can you replace the fan?

don't run machine or continually start it without the cpu fan running. it doesn't take much to destroy a cpu.
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November 2, 2013 2:29:15 AM

swifty_morgan said:
got another fan header on the motherboard?

can you replace the fan?

don't run machine or continually start it without the cpu fan running. it doesn't take much to destroy a cpu.


I have a 3 pin system fan header. The CPU fan uses 4 pins. I don't know which way to fit the 4 pin on the 3 pin.
Replacing the fan would be my last resort. I live in a remote area. It would take 3 weeks for another fan to arrive, wherever I buy one from.
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a b à CPUs
November 2, 2013 2:45:38 AM

if you look closely at the 4pin, you see it will only fit one way and that it's also okay to put that 4pin on the 3pin header. try it. ( also,if it's not a cpu header it will not spin up but will run at a constant speed. and you may also have to disable the shut off or fan speed indicator in the BIOS or the machine may keep shutting down)................. replace the fan or replace fan/heatsink combo.
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November 2, 2013 4:07:17 AM

swifty_morgan said:
if you look closely at the 4pin, you see it will only fit one way and that it's also okay to put that 4pin on the 3pin header. try it. ( also,if it's not a cpu header it will not spin up but will run at a constant speed. and you may also have to disable the shut off or fan speed indicator in the BIOS or the machine may keep shutting down)................. replace the fan or replace fan/heatsink combo.


The fan spins and the BIOS reports the RPM correctly under the system fan. So the fan isn't faulty, I guess. What could be the issue now?
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a b à CPUs
November 2, 2013 4:38:16 AM

if it didn't work on the old header, the old header is bad.............???? or are you saying the fan is still hooked to the old header?
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November 2, 2013 4:45:35 AM

swifty_morgan said:
if it didn't work on the old header, the old header is bad.............???? or are you saying the fan is still hooked to the old header?


The header is perfectly fine, as the fan spins up before the POST beep. I put the fan on the SYS_FAN header to see if the tachometer was bad, but the RPM is reported correctly. But putting the fan back on the CPU_FAN header makes the system report an error with the fan.
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a b à CPUs
November 2, 2013 4:55:03 AM

try a BIOS update.
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November 2, 2013 5:17:37 AM

swifty_morgan said:
try a BIOS update.


I have the latest BIOS... and the fan was working correctly a few hours ago. So I don't think it's a BIOS problem. Shall I plug in the System fan into the CPU_FAN header to check if the header has a problem?
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November 2, 2013 5:33:07 AM

I reset my BIOS and the issue disappeared. I still don't know what the problem was, but it's gone now. Thanks swifty_morgan.
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