Stupid fan wiring...

[Myka]

So I bought this super cool computer fan that's clear with blue LEDs thinking it will look sweet in my stand and would be easy to find an AC adapter power supply to plug into a wall outlet. Well, I was wrong (first time ever ), or at least I think I was wrong because I can't figure this thing out. I figure a 3-pin atx to a powersupply is easy...ohhh nooooo.

Wth do I have to do to make this work? Can I go 3-pin atx to usb to ac adapter power supply? I need 12V 1400 mA.