I think its the F12 key for that model. It has the UEFI BIOS (EZ mode).
Being an UEFI BIOS has nothing to do with the key needed to pull up BIOS Setup Menu. A quick check of the manual
for that motherboard shows on page 1-17, section 1.9, you hold down the Delete (Del) key to enter the BIOS Setup Menu, not F12.
This being a dual monitor setup, and this happening from Day 1, I go along with Troy on this. Assuming it eventually boots, you might go into your display properties and swap primary and secondary monitors, then reboot and see what happens. You might also consider a multi-monitor utility like UltraMon
– not free, but worth it.
Also, depending on your monitor(s) and/or graphics solution, you computer may not support the standard VGA resolution used during the BIOS Setup Menu and boot process. And only when the drivers for the graphics solution are loaded from the boot disk, do you get a display. I have seen this several times when using a digital video input (DVI or HDMI) on some older monitors. The solution was switching to an analog input when I needed to get into the BIOS Setup Menu. A pain, but it worked. This also works if the Boot screen and BIOS Setup Menu are only partly displayed - where the rest of the menu is off the screen.
That said, if you have never been able to get into the BIOS Setup Menu, does that mean you have never set the date and time? If so, then that could come back to bite you with timestamp issues. Hopefully being a new board, only the timezone is off by a few hours.
To expand on the shotgun posting on multiple forums or sites, it is considered poor forum etiquette because it ties up limited resources, and because you may get conflicting results, or confusion for the helpers due to unexpected results. Plus, it is good forum etiquette to follow through on each site, and when shotgun posting, it is common, sadly, for some threads to be left dangling - and that is frowned upon too. And again, this is "Internet" etiquette, not just here at Geekstogo. Thanks.