My display is turning green after doing graphic heavy work

Not sure if this is a cooling or graphics issue but when doing graphic heavy work in Adobe or video editing/watching the dark areas of the display have green lines. It eventually grows to the entire screen and I put it to sleep for a time and alls well when I return.

Any suggestions for possible fix or troubleshoot???

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Can you try plugging in an external monitor to see if the problem is visible on it. If it is then the graphics card is having problems.

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