Question Pc randomly shut down, motherboard rgb comes on but no diagnosis lights come on

[Posingchutoy]

My pc after using it I left for about a hour and in that time it shut its self off but the motherboard rgb is on still when I try to jump the pins nothing happens no diagnostic lights or anything I just replaced all the parts two weeks ago any ideas

 

[Posingchutoy]

I have a
I7-12700kf
Rx-6750
32gb ddr4
750w gold rated power supply
Just replaced everything but my cpu witch is a year old and my ram

 

[Posingchutoy]

Tested the psu no joy on the paper clip test