Phantom BIOS settings change

Mark R

Diamond Member
Oct 9, 1999
8,513
16
81
Just had a bit of an odd thing happen with my P8Z77.

Shut down at the end of the day and everything was working fine. Next morning, I boot up, and the system stops at POST with a CPU fan error (I have an oversized, low speed CPU fan, so normally have the fan check disabled). Anyway, I ignore the error and let the system boot.

The first thing I notice is that my VMs won't run. Virtualbox just whines about hardware virtualization not being available.

Sure enough, I reboot and check the BIOS settings, and sure enough a variety of random settings, including fan monitor, V-Tx and stuff (but not major stuff like CPU speed or boot order) have changed from where I had left them.

Just wondered what would cause a few random settings to change - it's not like the settings were reset to default, or there was a checksum error. And the mobo is only a few months old, so it's unlikely to be the battery.
 

Vectronic

Senior member
Jan 9, 2013
489
0
0
Unlikely low battery not only because of age, but because you always(?) get reset to factory if it was that.

My guess would be UEFI interaction... some kind of monitoring or tweaking software (or OS, or VM host, etc) that changed BIOS settings.