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PC posts, intake fan spins, exhaust fan doesn't

Hello all,

I have just finished building a new pc and while my system posts, my rear case fan does not spin.

I have a msi z97s krait mobo, an intel i5-4590, an EVGA 750w G2, and a corsair 400c case.

I am new to the pc scene and am seeking some help in trouble shooting. Upon powering on, the system posts like normal, gpu fans spin, intake case fan spins but the rear fan jolts slightly as if its about to spin, but doesnt.

I have tried plugging both of the fans into various headers on the mobo. Regardless, the intake fan still spins and the exhaust fan doesnt. Am i correct in assuming this is a dud fan?

Thank you in advance!
Reply to samuelwrandall
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  1. Best answer
    Try this. Log into bios, then look at your fan control. Check what your back fan is set to (DC vs PWM). If your fan is DC and the setting is on PWM, switch it and vice versa. If this isn't the issue, then yes perhaps it is a dud fan. You can try plugging it into a different fan header to check if it's an issue with the mobo header instead, but if not, then get a new fan.
    Reply to Sedivy
  2. Sedivy said:
    Try this. Log into bios, then look at your fan control. Check what your back fan is set to (DC vs PWM). If your fan is DC and the setting is on PWM, switch it and vice versa. If this isn't the issue, then yes perhaps it is a dud fan. You can try plugging it into a different fan header to check if it's an issue with the mobo header instead, but if not, then get a new fan.
    Reply to samuelwrandall
  3. Sedivy said:
    Try this. Log into bios, then look at your fan control. Check what your back fan is set to (DC vs PWM). If your fan is DC and the setting is on PWM, switch it and vice versa. If this isn't the issue, then yes perhaps it is a dud fan. You can try plugging it into a different fan header to check if it's an issue with the mobo header instead, but if not, then get a new fan.


    Cheers mate, sorry for slow reply. Yea i went into bios and made sure it was set to DC. No fix. I had previously tried different mobo headers- I tried again to no avail. Dud fan it is :)
    Reply to samuelwrandall
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