I replaced my 140 fan in the corsair tx750 with a noctua nf-a14 flx (another 140) and it doesnt move when I turn my computer on. It twitches a bit and if I give it a flick it overcomes its intertia and starts spinning. Also while its not spinning if I load the PSU by lauching a game or furmark the PSU fan kicks in. so two questions: Does this matter? should I just leave it and assume the threshold that it kicks in at is safety enough. Or if this isnt good enough other suggestions for getting this fan working in my PSU. I've thought about rerouting a cable from a fan header on the MB and powering the fan that way, but then the fan header in the PSU wouldnt be filled and the PSU might not turn on.