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#11
I would look at loading Optimized Defaults in UEFI firmware. It should be F9, probably - see my screenshot. Then go back to the security tab and disable Secure Boot. Also, have you tried booting from the USB flash drive on another computer?
The good news is ASUS is pretty good with warranty work. They had my daughter's computer that had a flickering screen hardware probably back to me in about 10 calendar days, but you do have to pay for shipping to them.