MacBook Pro screen extremely pixelated on start up

I've had my mac for under two years with no problems what so ever. Recently the screen seemed to cut in half and freeze, becoming pixelated once or twice. After rebooting the mac a couple of times it has started to boot up extremely pixelated so badly that nothing on the screen is at all visible. It then around 5 minutes later reverts to a blank white screen. I will attach some pictures to show the extent of the screen.
https://pbs.twimg.com/media/BVkNMj3IcAAqMCx.jpg:large
https://pbs.twimg.com/media/BVkOPnwIUAAg_XV.jpg:large
Any advice would be really appriciated,
Thanks, Sam.

Hi I am experiencing the same problem with my macbook pro. I purchased it about the same time too.
Thanks for this post.
It seems for the link below that we are not the only ones experiencing this problem.
http://appleinsider.com/articles/13/10/14/apples-2011-macbook-pro-lineup-sufferi ng-from-sporadic-gpu-failures

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