BOAC, UEFI is really 'bios mkII' and can be a useable operating system in its' own right. Some have a basic browser and basic programmes built-in. (A media centre etc..). My current pc has it, but I've had a look and can't see any settings that might be tripping Booglebox up.
A previous machine had a much more complex UEFI, but I don't have it here to play with.
Bb mentions that he's checked the 'bios', but it might be worth re-setting via the jumper/cmos battery if not already done.