I use istat pro and it tells me my right fan isn't running, and my left fan runs unusually faster than it usually does. Does this definitely mean that my right fan is broken or is it just the app or..? I have a mbp I've had since June which is why I'm just a bit skeptical. http://img812.imageshack.us/img812/9351/screenshot20101221at942.png [Edit] Sorry, should have specified from before. I have a 15" MBP, and here's the full thing (now the fan is running at normal speeds, mind you, but there still isn't a reading for the second fan and the machine heats up quicker than usual).