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So...tried doing somemore troubleshooting and nothing worked. For some reason didn't think to try this before but I tested the USBs on other computers in my home (some that I have installed Mac on before) and none of them would boot from the USBs at all. So I don't think it was the computer, but...

Dell Optiplex 780 Series Set BIOS settings and USB creation to the letter as per the installation guide. BIOS is updated to latest version as per Dell website. What happens is when I go to select the USB device boot option in boot menu, it will just return an error that no boot device could be...