Not all the 540 cases have led fans (I know the white cases come with led fans, don't believe the black ones do, not sure about the silver cases). So, first check to see if you actually got led fans with the case. If you didn't, that's your answer. If they are led fans and the fans work (just the leds are on the fritz), call Corsair. If the fan isn't working at all, try plugging it into another connector to determine if it is a faulty fan or a faulty connection. If it's a bad fan, again, call Corsair.