1/3 of my Macbook Pro screen is 3 vertical Bars...


i have had laptop on 3 years , no significant problems. couple of days ago though, laptop display got 3 vertical black/white/black bars on right third of screen , curious if dying.

connected external display , it's been awhile this, makes impossible use laptop anymore. can let me know what's going on?
 

perhaps graphics card failing?
 


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