Clean all the ventilation channels

  1. Disconnect the power cord.
  2. Remove the 3.5x16 screws (8 pcs).
  3. Take out the fan modules and disconnect the fan DC cords.
  4. Clean the parts under the fan modules with a vacuum cleaner and a cloth.
  5. Reinstall the fan modules.
  6. Clean the ventilation channels with a vacuum cleaner.