hi my laptop shows pixel that are multicoloured checkered and it doesnt go ast the blue screen, here is a video that tells u exactly wat i mean: YouTube - Macbook pro faulty help
Looks like it might be a GPU problem. Can you attach an external monitor or TV to your MBP and see if it does the same thing? Post back and let us know the results. The external monitor test will tell us if it's being caused by the GPU or something else. Also, if your machine is still under warranty or Apple care, you might think about having Apple look at it.
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