Question System dosent boot after 12 hour unpluged

May 7, 2019
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Hi
This is my fist question in this fourm and sry about mistakes and i use google transle.
My problem started when I changed the cpu. If the system is unplugged for 12 hours, the system will not post beep sound no fan spin again. But if I conect the green wire and the black pin of the 24 pin atx , the psu turns on, and if I connect all the wires back to the motherboard again, the system will work without problems. I took the psu warranty. They said that there is no problem with psu.
What do you think is the problem ?
Cpu: Amd ryzen 2400g
MB: msi b350 tomhwak
Psu: green 530 watt -es