I´ve upgraded my system to OSX 10.8 and since then the ventilators work at 100%, I´ve upgraded my system to OSX 10.8 and since then the ventilators work at 100%

Hi. Since I´ve upgraded to OSX 10.8 (mountain lion) on my iMac the ventilators work at 100% even without using any application. I´ve done what they suggest in support (switching off the machine, unplug it, wait 15 secs, restart SMC etc.) and nothing happened. Anybody knows how to fix it ??
Thanks a lot.

Please carefully read iMac SMC and PRAM reset for correct instructions on how to reset the SMC, do this 2x back to back.

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