Question I'm going crazy with my PC ( Doesn't turn on )

Jan 15, 2020
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Hello guys, first of all, sorry for my broken English.

I have a big issue with my PC, i build it buying some new/old components, everthing was good, but after 2 months, he started rebooting alone, i found where the problem come from ( it was the psu cable who goes to the gpu ), but after some weeks, when i turned of my PC to go sleep, the next day he didn't turn on, i tried a lot of things and nada, so i bought a new PSU because the old was kindda bad, i bought the Corsair CX550M, i got it yesterday, i put it today and when i turned on the PC, it worked for 2 min and then shuts off again, i removed the ram, cpu and useless things to try and nada, it turn on for 1 or 2 sec now and shut off instant'

If you can guys help me because i'm completely lost .... i'm tired ...

PSU : Corsair CX550M
MB : B350M Mortar
SSD : Samsung MZ-7PD256M
HDD : I dont have the reff
Tower : P400 Midi
GPU : MSI GTX 1060 6GB
CPU : Ryzen 5 1400
RAM : DDR4 8GB HyperX 2666 Mhz 16CL