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need help with corsair cx400


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i bought a corsair cx400w power supply today, i connected all the connectors to the motherboard and hard drives, etc.

but when i power on my computer it runs for a few seconds then shuts itself down and powers on again. and this is endless (thought maybe it has to do some stuff since it has all sorts of things like voltage detection).


so i thought maybe my ram are failing on me again i tried loading with only stick of ram but no luck. i even tried loading without the graphics card to see if i get any beeps but i dont. i also checked if there could be any short circuits somewhere but dont think there is.


this isnt a new build, just a new power supply.


could it be a faulty power supply?



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