Above all, to determine what is not "Tiny Cooling Fan" some external reason. Such as the plug is not plugged in, the fan switch is not fully open, the general fan should also pay attention to whether the timing of turn off, if these are not the problem, then it may be the reason "Tiny Cooling Fan" fan itself. Cause fan itself may include a fan might too long, the motor resistance increases, leading to fan can not rotate properly; fan motor overheating with a load capacity deteriorates, resulting in not rotate; inside the motor overheating protection Short circuit; "Tiny Cooling Fan" start capacitance smaller; fan shaft axial clearance is too large will lead to fan problems.