Question GB Z690I Aorus ULTRA i9 13900 / Radeon VEGA 56

[theking2]

Machine runs fine for days and weeks. Only when I cold reboot after being switched off for a couple of hours it boots into firmware. After that I can save and reboot and the machine goes on its marry way without a hickup.

What could cause the machine go into firmware after being switched off for some time?

 

[rgd1101]

full system spec? include brand and model of the psu

 

[Zerk2012]

What is being switched off.
Shutting down in windows and then flipping the power supply switch?

 

[SkyNetRising]

when I cold reboot after being switched off for a couple of hours it boots into firmware.
After that I can save and reboot and the machine goes on its marry way without a hickup.
What could cause the machine go into firmware after being switched off for some time?

Probably storage doesn't get detected fast enough for boot into OS.
Disable fast boot in BIOS.

May also want to disable hibernation in windows. This also disables hybrid sleep.
From elevated command prompt execute:

powercfg /h off​

 

[theking2]

Storage is a RAID set, after installation I automatically switch off hibernate. But both are good suggestions.

I will try without Ultra-Fast-Boot.