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Something to Keep In Mind
Just a reminder, while setting the processor speed to "Highest" will result in quieter fans (as it did under the one 10.3 update that caused a similar random fan cycling issue), remember that your G5 will draw somewhat more power in this state and thus cost you a bit more money on the electric bill, so even if this resolves the issue it's worth keeping an eye on MacFixIt or wherever for more permanent fixes.
Something to Keep In Mind
In my 20-inch iMac G5 the PMU reset and power testing buttons are next to each other--small, gray, about the size of an o in 12-point type. You can turn onthe machine and test the power supply by pressing the innermost button and see the little LEDs light up (there are four of them, but I forget the code at the moment). When I started that way (with the case's back removed) and then pressed the outer button, the fans quieted instantly, and now they are well-behaved. |
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