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Hey there,

This problem seems to be either a result of a faulty screen or graphics card processor. If I were you, I would make an appointment at an apple store and take it to them as soon as possible. Good luck! 🙂

Best Regards
 
^^^^^
I'll second that. This is obviously an issue. Make an appointment at Apple Store and get if fixed.
 
Thanks for the advice, my screen has been replaced so all seems to be working well again. (although my wallet is a fair bit lighter).....
 
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