10.4: Fix full-speed fan issue with 10.4.4 on iMac G5s

Jan 17, '06 06:01:00AM

Contributed by: Anonymous

Tiger only hintI ran the 10.4.4 update, and my fans then went flat out. Sounded like 1800nm of thrust out the rear of my machine. Several reboots did not fix the problem. So, irst I played with pmset, and as advised in another hint here, the processor performance settings (set to highest) in the Options section of the Energy Saver System Preferences panel.

Still nothing. Another hint suggested that you zap the pram. So, I did the Command-Alt-P-R, and waited through three "Booooong!" noises. Still my fans went nuts. Then I booted a 'Linux Live' CD, and the fans were normal. Back to OS X, and it was fans-flat-out again. Okay, I then:

  1. Unplugged my machine to move it closer to the phone to call Apple support.
  2. Threatened it with advice from an annoying call centre.
  3. Booted it up.
It then worked fine. I suspect it was the unplugging that reset whatever was causing it grief. A couple of people on a European chat server had the same problem. Unplugging their machines then starting them up once it was plugged in again gave the same solution. Weird.

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Mac OS X Hints
http://hints.macworld.com/article.php?story=20060112090527425