CPU fan won't start at boot, I can make it start but then suddenly stops

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dimitrisg7

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Dec 18, 2014
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For some weeks, I am dealing with the following problem. My cpu fan will not start at booting, but if I take something and try pushing it to spin persistently for about 5 minutes, it will finally start. Still, when working it is inefficient compared to before (35-40 before, 55-70 now) and after 15-20 hours of working it suddenly stops. If the power is cut off but the fan was still in motion and I restart the pc, the fan will work (still giving higher than average temps). Otherwise, if more than 10-20 seconds have passed from shutting down the fan won't start afterwards and bois recognise it too (giving error message about the fan). I just don't get it though... If something is broken, why is it able to start if i push it for some time, and why it stops for no reason afterwards?!
The mobo is Asus m3a78 pro, the cpu is amd phenom II x4 975 BE and the fan is coolermaster B10478-22BB-3CN-L1. Any ideas?
 
Solution
techgeek
It sounds like the bearing is shot in the fan. You will likely need to replace the fan. As fans get old the bearing wears to the point that there is friction and can cause issues with the fan starting. Which is what you are experiencing. Once pushed the fan may turn, but it turns slower than it normally would at a given voltage. As for the stopping on it's own. Once it begins to spin, the additional friction causes heat which in turn can cause the fan to stick.

I had a look at the fan online as I wasn't familiar with it. It is certainly a unique fan and it's listed as a server fan. My suggestion would be for the cost of this fan, you should be able to get a heatsink fan combo that will be better than what you have. Something...
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techgeek

techgeek

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Apr 11, 2004
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It sounds like the bearing is shot in the fan. You will likely need to replace the fan. As fans get old the bearing wears to the point that there is friction and can cause issues with the fan starting. Which is what you are experiencing. Once pushed the fan may turn, but it turns slower than it normally would at a given voltage. As for the stopping on it's own. Once it begins to spin, the additional friction causes heat which in turn can cause the fan to stick.

I had a look at the fan online as I wasn't familiar with it. It is certainly a unique fan and it's listed as a server fan. My suggestion would be for the cost of this fan, you should be able to get a heatsink fan combo that will be better than what you have. Something like the Hyper 212 EVO which is compatible with your socket (AM3). If you go this route just make sure that you make sure whatever heatsink you decide on will fit in your case. The Hyper 212 EVO that I suggested is 159mm tall.

 
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