Occasional horizontal purple line appearing for less than one second

My MBP would occasionally have a horizontal purple line appearing and disappearing for less than one second across the screen. The width is usually about 1 inch thick. It usually happens once or twice a day. Does anyone know if the problem comes from my screen or my GPU? Thank you!

Beantwoord deze vraag Dit probleem heb ik ook

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You'll need to check things using an external monitor to be sure.

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