While I don't have a solution for you, I highly doubt that a USB controller on your Motherboard is dead, otherwise your ports wouldn't work in ANY OS, or ANY bios or uefi. Also, when you said you'd searched all over your uefi for SecureBoot, have you looked in your Windows 8 setting option tab for secure boot. In my motherboard, SecureBoot only appears if windows 8 option is on