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This is a possible nVidia GPU issue.  If so Apple will replace the logic board for free.  Hook it up to an external monitor to see if the problem persists.  If so then it's most likely the GPU.  If not try moving the screen up and down and see if the picture comes back.  Let us know and we can proceed.  To be sure of which GPU you have please give us the last three figures of your serial number.  Thanks