So earlier today my rMBP (bought launch day) slowed down considerably and became incredibly laggy. I made it through class, closed it, and put it in my backpack. About three hours later, I take it out, find the computer to be incredibly hot, and it won't turn on. I plug it in (light turns red; charging), and the computer will turn on when it's plugged in, but the battery indicator won't go above 0% and it shuts off every time I unplug it. Thoughts?