So I've built my rig, and I'm trying to install Windows 8.1. I made a bootable USB drive for windows with Mac's boot camp application, and my windows 8.1 installation disk. I believe I've done that correctly, and from there I have no clue what to do. I plugged in the usb and booted my computer, and all that shows up is the black screen with the blinking underscore, and nothing happens when I click on my keyboard or mouse. When it isn't plugged in, all i get is the "reboot and select proper boot device" message. I either can't enter BIOS, or don't know how to. Any help or advice would be appreciated.