[SOLVED] Pc wont turn on sometimes, power switch does nothing, only mobo lights on

[seif199]

Mobo lights on , lan plug light on, pc wont turn on

I9 1085k no oc/ Asus ROG z490m G / corsair dominator 4000mhz 32gb/ psu 800w
Pc wont turn on, when i press the power button nothing happens, mobo rgb light are on , the lan plug on mobo lights on so seems mobo is fine, shorting power switch on mobo dont work so it is not the switch, paper clip shortning the psu works so psu seems to work, tried 2 different cmos batteries, tried reseating everything, tried only the 24 pin and the cpu 8pin still nothing, clearing cmos ,un plugging pc for a day , using a second working psu , still didnt work , what is the cause of this problem
Last friday this problem happened so i have done all of these steps and pc turned on by it self at night worked normal for 2 days then it happened again after a normal shutdown

 

[Lutfij]

800W is the advertised/stickered wattage of the PSU, for all we know, we could assume that it's the best unit money can buy or that you have an expensive paper weight. It's to avoid assumptions where we ask the end user to parse as much info as possible. First off, would be the specs.

That being said, when posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list them like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:

The paperclip test on a PSU doesn't do squat since that test asks users to induce a load on any of the PSU's end...which is often times a fan or a dead HDD. What that test does show you is that the PSU...works. What it doesn't show you is how much power the PSU can effectively output to the entire system.