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I rebooted many times with known-good USB drives in different ports. When I get to the boot choice (hit ESC at BIOS splash screen, follow prompt OR just F9 at BIOS splash screen) I see the internal hard drive, a blank but selectable line, then CD/DVD drive. I've gone into the BIOS and there's no secure boot option or anything but I can get into the boot order and the USB drive shows up there.
I'd sure like to know how this got downvoted – seizethecarp – 2018-11-05T14:36:02.030