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Green box on monitor lcd screen


Viewsonic vx2439wm 24in monitor

Monitor LCD screen had a green box in the upper right-hand corner of the screen today.  Didn’t bother messing with any controls, just had the user shut it off and turn back on.  Box was gone.

Anyone else had this problem before? 

What’s more likely:

  1. Monitor failure
  2. Video Card failure
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