If you're fixing a Windows 8.1 computer that is not booting, which BIOS setting will you modify?

In situations where a Windows 8.1 computer is not booting, changing the Boot Mode to UEFI is the appropriate action to take. Windows 8.1 is designed to work optimally with the UEFI (Unified Extensible Firmware Interface) system firmware, as it enhances the boot process with faster startup times, improved security features, and better handling of hardware initialization.

When the system is configured for UEFI and the operating system is installed in the same mode, it enables all the functionalities that Windows 8.1 can offer, including fast boot and support for larger hard drives with GPT (GUID Partition Table). If the system was previously operating under UEFI, reverting to Legacy mode could lead to compatibility issues or the inability to find the operating system altogether, worsening the boot problem.

In summary, modifying the BIOS setting to change the boot mode to UEFI ensures alignment with the designed operating environment for Windows 8.1, thereby addressing potential causes of boot failure.