@ danny2000 had one to repair a few days ago
I understand that Scout_03. When it is cycling on and off as designed, and as you mentioned, it will not give an error stating that the fan is not working.
In the user's situation above, this appears to be an error at post or from Windows.
Hopefully it is JUST the fan and not the sensor on the motherboard.
There is a VERY outside chance that the fan cable is disconnected, but I doubt it.