Answer to: retina fan noisy problemI had this problem, the solution was simple on my case, the fan was not in line (I think when I drop my laptop) the force was strong enough to move the fan from the right line or position, after open the laptop and clean the fan I notice the fan was not in line I push the fan and a hear a "Click" sound, after that the fan was able to move better. I close the laptop, and now is like brand new. ( I drop my laptop from my bed to the floor) was not a hard drop but I thing the noise begun there. just I notice a few months later. Simple solution for my case. I hope this information is useful for someone with a similar issue.