Unable to enter BIOS

While troubleshooting another issue I decided to boot from USB. I find now that I am unable to enter BIOS. In the past I would get a brief message during boot to hit a certain key, I believe that it was F2. Mow that message doesn't appear. I go to settings/recovery/advanced settings/troubleshoot/startup settings and I get a blank screen for at least 3 minutes if I click either "startup settings" or "UEFI Firmware settings"

How can I get into BIOS?

From what I've read, it's the F2 key. Restart and wait for the post beep, at the post beep....tap the F2 key repeatedly until the screen changes.

Thanks. I found the problem. I have 2 monitors and the bios option is appearing on the monitor that was turned off. I'll now disable the off monitor and continue.

Thanks for your input. This issue closed on my part.

Hi,
Yes it's best if using 2 monitors to have them both on :)