|OK, I've looked at the mainboard manual and the BIOS is identical to a new build I just made for my family, so I've got a good idea of where to look.|
Remeber, if in doubt you can always exit the BIOS without saving changes if you're unsure what you're doing.
Once you're in the BIOS, you want to select the option labelled "MB Intelligent Tweaker (M.I.T)" and press Enter.
You should get a screen with a whole list of settings, with system voltage control at the bottom. Even if everything is set to "Auto" and they're greyed out, you should still be able to see values for "Normal CPU Vcore" and "Normal Vcore NB"
CPU Vcore is the one we're interested in. Write that voltage down and then exit the BIOS by pressing Escape until you get a message saying something like "Exit without saving changes?" It may ask for a Y/N answer, so press Y then Enter to confirm you want to exit WITHOUT saving changes.
If you could then let us know what the Vcore value is, we might be able to shed some light on your problem.
Apologies if you already know how to navigate the BIOS, I just want to make sure!