Hello, My 13" 2009 MacBook Pro is shutting off after startup. It starts up fine, then I go to use it, and within about 10 seconds it goes into sleep. The sleep light goes solid, then after about 20 seconds it begins to pulsate. I could not wake it... I've tried it again over 10 times and each time the same thing happens. My MBP is under warrenty, being a month or two shy of the one year warrenty. Anyone have any suggestions, or should I just go and send it up north to an Apple retailer?