I have a recently out-of-warranty i5 MBA that overheats and shuts down, especially while charging. I mostly use it for email and web, which is apparently too much for it. I downloaded smcFanControl and noticed that the fan never leaves 2000 rpm. The temperature on the CPU cores will tick up until 200F+ and the computer will shutdown, but the fan never increases. I can use the computer just fine if I keep an eye on the temperature and manually increase the fan temperature with smcFanControl, but this is only a stop gap and is annoying to have to do since this is the type of thing that you would think you could, you know, computerize. I've done some searching but haven't seen others having this problem. Any suggestions for a permanent fix? The Genius Bar just wants to charge me to replace the logic board, which seems like throwing parts at a problem instead of actually solving it. This is my first Mac and while it was good while it worked, I can just get a new PC for a little more than the price a the logic board.