PC does not power on(sometimes)

[Sturb]

Hi, I recently built myself ryzen 5 5600 on msi b550 gaming plus motherboard. I kept my old power supply Seasonic focus 850w.

When i finished build everything worked fine, but the next day when i wanted to turn on my pc nothing happened. My first thought was that i have bad psu, tried to turn it on by connecting pins on the cable to motherboard, fans spin and cpu diagnostic led turned on, no video. Took off cooler and tried my old ryzen 5 1600(not sure its even compatible) and got video out and got to windows. Then i returned ryzen 5 5600 and pc turned on and worked fine. Did a few restarts and applied msi oc for cpu and xmp. Turned off for like 4-5 hours and does not turn on(only thing that reacts is bios flash led).

Cpu temperature in aida stress test was around 66°C

Newest bios version

And tried cmos reset

 

Other  omponents:

gpu rx 6700 xt

Corsair vengence 2x8gb cl16 3000Mhz

And two m.2 ssd can fill later when needed exact products.

Edit: An hour later pc turned on.

So, is that going to be new PSU?

[Chapunna]

Dont apply oc settings, boot without Oc