What's the little button on the left side of my Macbook Pro do?

Why is macbook pro display crashing? Pls help me!?

Hi Recently my computer has been freezing with this odd checkered pattern appearing from top right to bottom left. The checkers are small, about the size of the spotlight icon, and cover the screen in diagonal parallel lines. When this happens sound continues to play normally but everything freezes, and the power-button must be held down. Does anyone know whats going on/how to fix this problem. Thanks. i bought this june 2006. so i don't know if the apple repair applies. i dont have apple care. i'm totally screwed Macbook Pro 15" 2 GHz Mac OS X (10.4.11)
Answer:

ask apple i believe they have a place online u can go to for problems

joyce_an... at Yahoo! Answers Visit the source

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