It is worth noting that if the "Micro Cooling Fan" for a long time to issue whirring sound, most likely from dust or friction between the shaft with bearings, recommends that users regularly "Micro Cooling Fan" to remove dust or grease related aftermarket maintenance. We recommend that you use the notebook normal maintenance cleaning cycle is six months since the outlet of the notebook is quite thin fins, once gathered dust blocked the export of natural books temperature will rise, "Micro Cooling Fan" speed high , subsequently loud noise, high temperature, the phenomenon of blue screen crashes followed.