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Power supply problem :(

my power supply
Cooler Master V850 Gold V2, 80 Plus Gold Certified Fully Modular
does not want to run without mother board
it only runs perfectly with mother board
i tried every single kind of this tools :


and it dosnt work
it just spin fan 2 seconds and stopes

jump the pins in the 24 pin connector to turn the psu on, if that doesnt work, sounds like a bad psu

hello, were you able to solve it? I have the same problem with 3 new power supply. if you could help me! Thank you

Are you using a jumper of some sort? If not, an ATX power supply will not turn on without a motherboard connection.

If so, and fans are not spinning, many power supply fans do not spin until they reach a higher load.

yes, I make a jumper between ps-on and 0v and the fan turns on and immediately turns off… I have 1 gpu and riser connected and it does the same. but I connect it to the motherboard and it works. I do not know what it is

Are you sure it is not supply power? Fans may not spin when less than 50% load.

Have you connect a riser with LEDs or something to this power supply?

If that is not working, the jumper is not right. Personally I use these:
http://www.add2psu.com