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PSU fan only spins for a split second... then stops??!!

  • Power Supplies
  • Fan
  • Components
  • Product
Last response: in Components
January 10, 2013 4:02:11 PM

I have built a system for my sister and I'm having this problem. The power supply fan starts to spin for a second, then stops. I have triple checked all connections, and even went down to only cpu, mobo and psu. Still nothing but a slight spin.

500w Dirblotek PSU
AMD Athlon II
BioStar A780L3B mobo
4 GB DDR3 RAM 1066

Any suggestions? Think the mobo is dead? If so, how do I check?

Anymore info needed... can be provided.

Thanks in advance!

More about : psu fan spins split stops

a b ) Power supply
January 10, 2013 4:56:26 PM

it can be a faulty psu. i had a power supply do the same thing to me and i would push the fan with a finger to jump start it...later on the fan would start up automatically but the psu broke 4 months down the road so if its working weird now replace it while you can

Best solution

a c 86 ) Power supply
January 10, 2013 5:03:56 PM

Well, it it is -->THIS <-- , then it is not a good power supply to be honest. Has less power then a quality 250 watt unit.

If it was a newer seasonic based unit, I would guess it is a feature as those do not run the fan under 20-30% load.

Only thing I can say is to run the system for a bit and see if it starts. The fan may be too hard to turn and the power supply starts at full speed then drops it to a point that it can no longer turn it.

Your option then is a fan swap OR new power supply.

Just do not load up too much on that power supply.
a b ) Power supply
January 10, 2013 5:10:49 PM

I know you triple checked the connections but are you sure you hooked up the separate 12v. CPU connector? If you miss that one then you'll get this exact problem.