This is a known issue in Macbook Pros around 2011. They have two graphics cards, which are switched dynamically for the best performance/output. If your Macbook starts showing screens with lines all over, and gets stuck and you've to restart frequently, this could be a Graphics card issue. Easy fix would be to install the app called gfxCardStatus, which allows you to select how the graphics cards are being used. It's fixed the issue for many people in our company.
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