Power supply works but not really

My old power supply died so I had to get a new one and I installed a Dark Power Pro 10 1200W. I wired everything but when I plugged the power cable all of the fens went on, everything looked like the pc is on and then it went completely off. The little light on the motherboard is on. When I unplug the power cable and wait for the light to go off and plug it in again same thing happens.
I tried the paper clip trick and it is pretty much the same. It goes on for a sec and then off again.
I tried unplugging the ram, HDDs, Video card, CPU... nothing. When this happens while everything is plugged in all of the fans start working.
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More about power supply works really
  1. did you have to remove the motherboard to install your psu,also check if the cable are connected to the right place and not shorting on the case ?
  2. I didn't have to remove the motherboard and as far as I can tell they are all connected to the right places
  3. did you try with only one stick of memory the cpu and the hdd that have the os on if there is a onboard video remove the pci-e for test
  4. I did and it didn't work
    I decided to get a voltage regulator hoping that it might help
    I will post updates soon
  5. did you plug the 4 or 8 pins power cable to the motherboard ?
  6. Well if it fails the paper clip trick then there's clearly something wrong with the power supply. Same thing happened in my computer build, fans would spin for a few seconds and everything looks like it's working fine, then the fans will stop spinning and nothing happens. Swapped out the power supplies AND tested it with a voltmeter; confirmed dead twofold. Also tried the paper clip trick, and passed it, but that doesn't always mean the power supply is working correctly.
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