Since a few days (it’s getting colder here) I have an annoying problem:
When I power on my PC, it starts for a few seconds, then powers off to reboot with a verbose message screen saying “CPU Fan error / Press F1”.
At that time the CPU spins with something like 550RPM.
So I checked the settings: The lower speed warning was actually set to 600 RPM, so I adjusted it to 500RPM.
However the problem still occurs, and then all BIOS settings are reset to default so that my PC won’t boot anyway (it needs RAID mode, not AHCI mode).
Here is what I see a few moments after entering BIOS:
What could I do to fix it?
I suspect that the CPU fan is spinning slowly because:
- It’s cold and it doesn’t have to spin faster
- The cold temperature is making the oil somewhat thicker, so the fan spins a bit slower than usual
- The fan and its bearings are getting older and maybe some dust makes the fan spin a bit slower than usual
Before someone asks:
Of course the CPU fan speeds up once the CPU gets warmer.
