I have no add on cards. Board has on board NICs. video, etc
I have not even managed to reach step 3 on your quick start guide.
When i power on PC with USB drive in place, it start booting from the USB drive, i get a screen with some dots moving across the screen for about two and a half lines, then the screen clears and i just get a blank screen.
I am assuming that at this stage i would expect some sort of prompt to appear. this is not happening.
We don't have this system board to verify any chance to test with another system. Test with different USB device settings with emulation Type: Hard Disk, USB Mass Storage Reset Delay: 10 sec. and USB V1.1, if USB 2.0. Try reformatting the USB stick again as well.