I have the exact same power supply LOL.
Did you make sure everything is plugged in? The Haf x case needs power from the PSU in order for the lights to show, and you have to plug in a specific cable.
No i didnt.... i only hooked up direct cables to my cpu (4 pin),mobo,hard drive, optical drive. I haven't used the 8 pin power cable.... where does that one go to O.o