Brand new build does not boot at first power button pressed - Case Corsair Airflow 4000D

[Nalioh]

Hi everyone!  Do you have any idea how to fix this problem? It happens only at first boot of the day, then i can use the pc for 12 hours and nothing else happen. It’s a new build and i have already changed ram, the psu its a be quiet platinum 80+ 850w. Major pins are ok, any tips? Do you think its a faulty power button from the case?

https://imgur.com/a/r91mNfR video about the problem

[LeDoyen]

what happens if you just press the button once and wait instead of pressing right away after the first try?

 

[Corsair Jagtech]

Hi everyone!  Do you have any idea how to fix this problem? It happens only at first boot of the day, then i can use the pc for 12 hours and nothing else happen. It’s a new build and i have already changed ram, the psu its a be quiet platinum 80+ 850w. Major pins are ok, any tips? Do you think its a faulty power button from the case?

https://imgur.com/a/r91mNfR video about the problem

Hey there, So sorry for the issue you are having. I am turning this into a ticket to get some more information and help provide a resolution.

[Nalioh]

22 hours ago, LeDoyen said:

what happens if you just press the button once and wait instead of pressing right away after the first try?

 

I’ve tried to push and wait, the monitor blink and then nothing

[LeDoyen]

it seems to behave as if the PSU was too slow to send the "power ok" signal to the motherboard. It's a weird issue, but i'd be surprised if the case was even remotely involved.

Do you happen to switch the PSU off when you stop using the computer? Or does it happen with the PSU constantly powerred on as it should be?

[Nalioh]

Hi sorry for the late reply, i've been troubleshooting for the same issue for a month now.
I've used to let the PSU constantly powered.
I've switched it off only when i had to touch stuff inside the case.

At the moment i've changed RAM, Changed GPU, Recabled everything ( and it seemed to work for an entire day, but then the same problem appeared ), updated bios, now i'll try to reset the CMOS removing the battery.
Tomorrow i'll try a new PSU downgrading from 850w platinum to 650w platinum, i had a faulty 3070 ti and now i've a 3070, should be fine, at least for a test.
Then i've to try to change mobo and the I/O button.

I do not recall exactly when it all started, if it was when i changed PSU or the AIO Pump, i didn't have a proper GPU at the time so i've started using my old 1060 gb.
I've also tested start pc without gpu connected and it had the same problem, not always but sometimes..

Any help it's really appreciated..