So I cannot boot into my Ubuntu or recovery and I tried to boot into Live Ubuntu 14.04.03 USB, but when I select first priority as USB in BIOS, and reboot system, I always get this message on black screen:
Reboot and Select proper Boot device or insert Boot Media in selected Boot device and press a key.
I tried all 3 USB slots, and when I press a key I get this message over again.
I'm pretty positive it's good USB.
USB is set as first priority to boot: