What is UEFI?
When I have had a PC that won't boot in the past, I've been able to take its hard drive, connect it to a working PC, and access the data on the drive.
I have had a PC that I couldn't do that with. It had UEFI enabled and Windows 8 installed.
Was I just unlucky with something else, or does UEFI prevent a PC from accessing another PC's hard drive in the way I describe? I got a message with words to the effect "That drive isn't formatted, do you want to format it now?".