a. Hold the "Micro Cooling Fan" feel its vibration, and the transformation of different angles FLAC feeling is the same, the fan vibration well, if vibrations may produce a total shock to the chassis, before some start-up sound very loud when people mainly produce shock when "Micro Cooling Fan" start caused.
b. should only hear the sound of the wind (Some may have high speed electromagnetic sound), if other sounds are instructions on their quality is not very good. If it is not, as seven centimeters high fan speed DC fan speed does not exceed 3500RPM, but the wind could have explained the poor quality of their fans!
c. by hand to prevent its "Micro Cooling Fan" rotation (do not put the blade broke) a minute or so, touch the center of its blades feel its temperature, so if the temperature is high, the failure to prevent the fan when stuck It was burned, causing a fire.