[Hellzone]

USB ports dont require there own power. If they dont work its A. The motherboard is broken or B. The System Drivers are somehow conflicting. This could also mean that your usb may be disabled. Check your Device manager. I use a 500watt btw, im about to upgrade to a 1200watt.
I used a asus board once, i had issues with my webcam being pluged in. Every thing would lag without reason.