Remove the "Micro Cooling Fan" from the heat sink, turn on the bottom surface of the oil seal, you can see the axis of the fan, if the fan for a long time in a dusty place and did not do the cleaning job, fan bearings (mostly nylon bearings) oil will be solidified on the hard, black. In this case you should first "Micro Cooling Fan" bearing oil removed, can wipe them with a cotton swab or paper, can also be used wooden toothpick slowly removed, but not forced, to chapter bearing __ BU heat sink and fan open and to avoid damage to the coil. Then began a lubricating. You can use sewing machine oil or automotive engine oil, do not use household seasoning oil, edible oil, because oil will be solidified or deterioration. Using a pipette or forceps dip oil, and a drop of lubricating oil dropped in "Micro Cooling Fan" axis can be, not too much.