Can't access bios via External Monitor

Solution
In Control Panel>Display section, is the external monitor set as Extended Display? If so, BIOS has no no way of knowing the laptop screen isn't working so it's displaying on the dead screen. Switch to an alternative setting so that it only shows on the external.
In Control Panel>Display section, is the external monitor set as Extended Display? If so, BIOS has no no way of knowing the laptop screen isn't working so it's displaying on the dead screen. Switch to an alternative setting so that it only shows on the external.
 
Solution