I am working with a buddy's Dell laptop that has the backlight on the screen died. I am not sure an external monitor will work with the BIOS settings. You could experiment with an HDMI connection, but I'm not sure if it would change how the laptop's own startup screen is displayed. Since you don't appear to be familiar with its use, I'm guessing you've simply chosen the external monitor to be the primary display within Windows when it was detected, which indeed doesn't alter which screen the POST and BIOS screen will appear on. The function may or may not work before the POST is completed. Do you mean just F10, or Fn/F10? If you hold down the Fn key, each time you press F10 the display should cycle through Internal alone, Both, External alone.
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