So I've noticed something strange that causes my Macbook Pro to turn off temporarily. The screen and the keyboard light both go dark. It only seems to happen when I put my Galaxy S smartphone on the front-left corner. And it returns to normal a few seconds after I remove the phone. It even happens even when the phone is turned off with the battery removed. And it's only the left side (which does not have the hard drive), and it doesn't happen with my iPod Classic. I'm not asking for tech support, as I'm sure this is an intentional safety feature. I'm just curious to find out what it is. What component is it protecting?