So I don't even know where to start...

that would be a bad motherboard my friend i ordered one from ECS a few months ago did the same thing so its most likely your motherboard.
 
Let me get this straight.
When you unplug the 12V the GPU and the power supply power up?
However when you plug in the 12V the GPU and power supply don't power up?
Is that what you're saying? I'm kinda confused.
 
Well, I know the power supply works, because the motherboard light shows, but no the fan doesn't turn on. And I can hear it working, as for the GPU the fan doesn't turn on either when the 12v is plugged in.
 
Well, I know the power supply works, because the motherboard light shows, but no the fan doesn't turn on. And I can hear it working, as for the GPU the fan doesn't turn on either when the 12v is plugged in.

And when you unplug the 12V the fans turn on?
 
Whoa that is weird.
That ain't normal at all.
I'm not smart enough to solve that :D
Someone will jump in :)
Give it a day :)
 
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