Can't Install Windows 7 from usb

I built my first computer recently, it did good on the POST and everything. I plugged in my usb on the 2.0 port to install the OS but the screen showed was "Boot and Select proper Boot device
Insert Boot Media in selected Boot device and press a key" So I plug the usb in and press whatever key and nothing happens.. anyone know how to do this?
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  1. anonymous1 said:
    without knowing what MB you have... at power on press the "f12" key.. then select USB and you should be good to go.

    Ya probably should've put that. I found a way to do it though, thanks anyways!
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