Specs? It's not an OS issue if the power button isn't even working because that's controlled by the UEFI firmware or BIOS. There's something else going on. Maybe a very dusty system or some insects have started calling your PC mobo a home. It could also be related to a bad PSU.
My case has dust filters and it's pretty much spotless inside. I have a EVGA Gold 750W power supply and a 5700x with an AIO. People have a hard time accepting there is software eg. OS and there is hardware. The bios is the least of my concerns even though I always have the most recent bios.
Nobody wants to consider Microsoft keeps rolling out major updates and something is bound to go wrong. But don't worry, they always fix it eventually. Windows 11 has had some issues even a complete clean reinstall of Windows 11 cannot always fix.