THERE'S A HORIZONTAL LINE ACROSS MY MONITOR.  (5.3)
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       All Sony Trinitron monitors have a stabilizing wire in position 
  to cast a shadow about three quarters of the way down the screen.  
  Larger monitors also have a wire about a third of the way down from 
  the top of the display.  There is no way to fix this short of 
  redesigning the Trinitron tube.  This line is more obvious on some 
  monitors than others so if it seems particularly bad you can try to 
  convince the dealer you bought it from to exchange the monitor.  
  Other than that there's nothing that can be done about it.