Does your monitor screen have areas of discoloration that mysteriously move and change shape like Jupiter's spot? They're most likely caused by magnetic fields that accumulate on monitors when users run them continuously. The fix is easy: Just neutralise these rogue fields by pushing the degauss button -- often labelled with a picture of a magnet -- on the front of your monitor. If there's no button, turn your monitor off and on once. Most monitors automatically degauss their screen when they power up.