I happened to reinstall [clean install] Mavericks today. When I was done with everything I also installed iStat. I did not have any cooling issues until I did so (both), but now the fans just don't pick up, they constantly run on the same speed. I tried different active sets, medium and high works just fine [I mean, fans are still operating]; but that "adapted speed" that you would expect under normal circumstances is not there anymore. What shall I do? PS: System/machine specs are in my signature. PPS: Thanks.