make sure the usb stick formatted for fat 32. the lower usb port under the ethernet is the usb port. make sure power is off on the mb. if the usb stick is readable and the flash file named right and is for the right mb. the flashabck port should blink for a bit. make sure you have the right bios for the right mb. there one of those mb that has usb 3.1 ports. it not the same bios. also try another brand of usb sticks.