Asus Rog Strix Z790-H Boot problem

[Nivero]

Hello, I have an unusual problem with my computer, namely the computer does not want to turn on, sometimes it helps to disconnect it from the power supply for some time. It turns off at random times - even without load. The steps I have already taken, I tested RAM, a different power supply, a different graphics card, disks and processor, unfortunately I have no warranty for the board, but maybe someone would have a way to fix it or know what exactly could be damaged.

[amazanik]

Have the same issue....

My solution: enable in BIOS S4+S5 mode - total power-off, now OK.

When I shutdown the motherboard, the BIOS FLBK LED starts blinking green continuously.
If I shutdown the PSU, then power it on, the BIOS FLBK LED starts blinking green again.
In this state if I try to power on the motherboard nothing happens : no fans running, no POST.
Now if I click the CLEAR CMOS button, the motherboard starts, do POST normaly (less then 30s) and enter BIOS. I set default parameters, reboot, windows 11 starts and all run fine, until I shundown the motherboard again.