I have had my Macbook for almost a year, and it's worked fine so far. Suddenly, out of nowhere, everything just seems to stop responding. I shut down the laptop and then turned it back on, then realized that the Trackpad wasn't working, and neither were any of the keys. The Caps Lock light doesn't even turn on when I hit it. What happened? How do I fix this? Right when it happened, I was using iTunes and had a couple Safari windows open.