Computers have moving parts such as fans on their CPU’s, Power Supplies,   Video Cards and in some cases, on the case itself. Each fan is   important for the smooth operation of the computer because they keep the   system cool. Should Dust, Cigarette Smoke  (which forms a paste when in  contact with dust) or Pet Hair clog up  one of these fans and prevent it  from spinning, can cause those parts  of the computer to overheat and  become damaged. 
Before all else begins, power down or shutdown your PC and remove all  power cables.  Ensure too that we remove all cables from peripheral  devices. As a  rule of thumb, it is prerogative that we label all cords,  cables and  devices properly either with a masking tape or labeling  sticker so as  to ensure we never forget to put them back into place  during  re-assembly of our unit. For precaution, make yourself properly   grounded using a wrist grounding strap before opening the PC case. Place   all the screws in a secured place so you will avoid losing it.
Once the dust has settled, reassemble the case, re-attach all devices and you are all done. 







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