Motherboard not working

So I am building a new PC and my PSU works with my old motherboard but not my new one. When I plug in the 24pin into the new motherboard my gtx 1080s don't turn on nor does anything. But when I plug in the 24 pin in the old 20 pin slot by detaching 4 pins every thing turns on. Any ideas on how to fix this
Reply to diabjason4
3 answers Last reply
More about motherboard working
  1. Please post your full system spec.

    A PSU running one system is no guarantee it'll run any other system.

    As for the 24pin that can split to 20+4, I assume the PSU must be quite old at this point?
    Reply to Barty1884
  2. What is your PSU model?
    Reply to Snipergod87
  3. I have a 1200 watts corsair PSU it is very new
    Reply to diabjason4
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