Computer won't boot unless I flip the power supply off and on


So the only way I can turn on my PC is by turning off the power supply switch, waiting about 5 seconds, and then turn it back on. I have tried many things already and I still have the same problem, this is what I have done so far...

  1. change the ram, continue with the problem.
  2. change the power supply, continue with the problem.
  3. change the processor, continue with the problem.
  4. I took out all the hardware and build everything outside of the case to confirm that there was no electrical problem inside the case, and the problem persisted.
  5. tried another video card, and the problem was still there.
  6. tried with the integrated cpu graphics, and the problem continue.

Actual Hardware: 

  • CPU - i9 9900k
  • GPU - Gigabyte RTX 3070 Gaming OC
  • MotherBoard - Gigabyte Z390 Aorus Ultra rev 1.0
  • Power - PoweSpec 850W 80+ Gold (PSX 850GFM)
  • RAM - G-SKILL Trident Z Neo 16x2 (32GB) F4-3600C16D-32GTZNC
  • M.2 - Inland Platinum 2TB SSD 3D QLC NAND M.2 2280

Any idea why I cannot turn off my pc and turn it on without having to switch on and off the power supply?

I will really appreciate the help



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