Thanks for the responses guys. Well I actually just moved into a new case, Antec P280, and upgraded to a GTX 480. With the new (power hungry) graphics card, the fan kicks on at idle. I don't know if my old GTX 260 just simply draw enough power because I physically did not see the fan spin even while running Prime95. I saw charts on Corsair's website that indicated it would kick on after about 350 watts. Also I did dust off the psu when I moved it into the new case so that could potentially be the reason. Nonetheless the fan does indeed work and all is well. Thanks again.