Hi, I have a 13" 2011 Macbook Pro since it was released and have got no problems with it until last month. My Macbook occasionally lags or becomes very slow at random moments. When I check activity monitor, it shows that the process: kernel_task has 250-300% CPU load. What's very odd about that is that my CPU doesn't get hot at all (and fans don't spin faster). I initially thought the problem was with Lion, so I patiently waited for 10.7.2, but since the problem still persists, I did a clean install yesterday. Today, I used my Macbook again and the problem is still there! I did multiple hardware tests and most of the times, there are no problems found, however, last time it showed the error: 4SNS/1/40000000: IC0R-12.793. I googled a bit but didn't find very much, I think there's something wrong with a sensor. Can anyone help me out here?