line that runs through the desktop screen

I was doing a white line down screen - only occasionally.  When I try to get a screenshot, the line is never in the picture.  It seems that the line disappears as soon as I press a button to do something.  is this a symptom of something devastating, looms around the corner? Should I panic or just put on my blinders on and increase the volume?

Is it still there when you start? Until you press a button any? If it's a hardware problem, you can start the diagnostics of material holding down d d or command to start and run a test.  This test is not final as the apple store has better test software.  You could try a reset of the pram and see if it clears.  https://support.Apple.com/en-us/HT204063

Tags: Notebooks

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