Hello i just bought months exactly august 10 on Apple Store Northstar 13" i7 and I complete love it. But the week ago I got my room hot because it was cold day I was charging the laptop connected the iPhone 4s with USB and other hard drive USB but charged with AC adapter and the Fan was at Maximus and very noise. Well suddenly turn off the laptop an I smell like something got burned inside. Last Friday I took it to the apple store and the appleguy told me the first bunch of air 2011 got problems with the motherboard with some chips on it and his MacBook air got the same problem. He checked mine at genius bar and told me that was the mother board lucky i still have warranty so no problem. But guys like me whom has one be aware of that problem and try to to the same and get try the same steps or maybe the weather in a room very hot like 30 Celsius grades. I hope to help somebody with this thread.