So i built a new computer and my asus gtx 580 directcu ii led light stays on when the computer is off. I have to turn the psu switch off so the lights go away. Is that normal or have i done something.
It's normal. All high-end Asus products have annoying LEDs like that, though you can disable the ones on the motherboards. Not sure if anything in Asus' software can disable the ones on graphics cards.