I'm building my first PC and seem to have hit a wall. For reference purposes I have a NZXTsource 220 case with an ASROCK B85 pro4 motherboard and a XFX TS550 psu. I've hooked everything up according to the manuals however when I hit the power button on the case nothing happens. It appears the motherboard is getting power because when I plug the mouse into the usb port the led lights come on. I've double checked the wires from the power button to the motherboard and they appear to be in the correct slots. I'm at a loss here, can someone assist me in troubleshooting? Thanks!