To figure this out you need an external display. Does the effect show up on it? If it does the logic board will need replacement, if the image is clean that proves the display is bad.
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When did you buy the system? If you know what is your countries warranty period as well.
Where do you live? Country and nearest major city. Also do you have access to an Apple Store as clearly this provider failed you.
To figure this out you need an external display. Does the effect show up on it? If it does the logic board will need replacement, if the image is clean that proves the display is bad.
Where do you live? Country and nearest major city. Also do you have access to an Apple Store as clearly this provider failed you.