I have an Asrock 970 Extreme3 but I'm having some issues with it. When I boot it posts and I can get into BIOS, but when I try to boot from my USB device to install Windows it sits at a black screen with a blinking cursor and does nothing. This is a fresh build. If I don't choose the boot device ti still just sits at the black screen wtiha blinking cursor.
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What happens if you boot without the USB plugged in? (And no disk in your optical drive if you have one)