Yesterday i build my pc, and i didn't had any problem in terms of hardware. But today a I didn't got my windows 8.1 pro 64 bits to work. I create a bootable USB, then i change the boot priority in my m5a99fx pro r2.0 bios. But when i but when i turn my pc the monitor always (with or without my usb) show this in a black background "reboot and select a propper boot device". Im almost positive that have done every single step but if you know what could be the problem I would be glad to know it, specialy if you have a posible solution.
Thanks for the attention and escuse my bad english