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Power Supply not working ?

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Hello, i bought a TX750M Semi-Modular ATX PSU but the fan isn't working. When i turn on my computer the fan start to spin, but after 5 seconds it stops. I have 

5 extra fan in my computer & 1 Kraken X73

I know some PSU don't spin if is not needed.. im new on this world.. maybe someone could help me 

thanks you

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the TX-M has zero RPM mode yes. If cooling is not needed, the fan won't spin, so that's normal. It will kick in automatically under heady load.

At startup the PSU tests the fan by spinning it to make sure it's operationnal, then stop it.. until it is needed.

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