Originally Posted by ad556
Originally Posted by nickt1862
Try this first: take out the fan and blow air gently in the rear hub area in the opening to where the fan blade hub is and then try it again.
If that doesn't work, just RMA the fan NOT the entire case.
Hope this helps.
I've tried to unscrew the fan but the screws are in pretty tight, ill try and take it out again and see if it works.
Also when you eventually get the fan in your hands, check that the fan blades to the hub doesn't have real bad "wobbly" play as I wouldn't re-install it back if that were the scenario.
I've had bad cooler master fans out of the box that I RMA-ed, so you're not the first.