Can't find Windows USB Flash Drive in Boot Options

[Nel-]

Hi
I am installing Windows on my new system. This time im using a USB instead of CD/DVD as I used to.
But the USB does not show up under boot options. Under the BIOS I have set USB Support to Full Initialization and it still does not show up.
I have also used a differnt USB port, and rebotted the system 3 times.

Specs:
Windows 10 USB Flash Drive
Z97-A
i5-4670k
CM Hyper 212 Evo
GTX 780
EVGA G2 750
8gb Corsair Vengeance
1tb WD Blue

Thanks for the help

 

[Nel-]

I plugged the usb into a USB 2.0 port and when the system rebotted, it instantly came with Windows installation.