Built a new desktop and have windows 10 media installed on a USB flash drive, attempting to install from the flash drive and boot windows installation window, when I set priorities to boot from usb then save and exit the PC restarts and the display just shows a white underscore mark in top left of screen, the windows logo flashes on for a split second and goes off, the white mark still appears at top left of screen and nothing happenes? I have tried to keep resseting bios and changing priorities to try and sort this out but nothing is happening?