Use of poor quality heat "Micro Cooling Fan", in the production of this type of fan due to defects in workmanship, the center of gravity may not be in the blades axis, forming a "eccentric" and use over time, fans of "eccentric" phenomenon will become more serious, it will not only produce noise, serious and may damage CPU. In this regard, can be removed altogether, and then hanging with string at the center position, let it sink to the still to see what direction, at the end of the sinking on light grinding wheel a few times, then test, has been after the fan can be installed in a horizontal position and then go to.