Computer wont turn on after shutting down

My computer is not turning on after shutting down. I tried turning it on after a few days and it worked. Then after shutting it down it wont turn on again. I replaced my old psu to seasonic S12II 620w but nothing happened. I am using asrock extreme4 bought it 2 months ago. Please help.
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  1. Best answer
    it would help if we knew the whole system.

    things to check:
    power supply: make sure that everything is connected properly (not loose)
    main power
    CPU power
    PCI-ex power to graphics card

    RAM: make sure that they are secure and in the correct slots

    this is all I can think of right now without knowing your setup.
  2. Is the 4 pin power connector plugged in this will prevent your computer from booting up or turning on.
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