Vertical green lines on 2011 27" imac

Hi
I have developed this display issue with my mid 2011 27" imac, where green vertical lines will appear on the left hand side of the screen, it appears to be only present on black screen colours only. I presume this will be an impending GPU failure??? After a while the center of the screen will also develop the same issue with the white colurs displaying blue vertical lines.
Thanks
Eric

Welcome to Apple Support Communities
It looks like a GPU issue, but today may be your lucky day. See > http://9to5mac.com/2013/08/16/apple-opens-graphics-card-replacement-program-for- some-mid-2011-imacs/
Some Mid 2011 27-inch iMacs have a defective AMD GPU that may cause this type of problems. Make a backup of your files with Time Machine and take the computer to an Apple Store or reseller, pointing the website I gave you

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