My lapops fan keeps making this electronic humming noise?

Very well, the fan system can take in a lot of dust and stuff while its doing its ventilation practice, which helps insulate at home the laptop. Thus, making it hotter in location than it actually should be, making the fan work harder. You've to lock you personal of completely, get AN air compressor and sprout some air through the ventilating system, to get rid of the dust. Hope this helps