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Something to Keep In Mind
Authored by: Makosuke on Nov 07, '05 06:06:37PM

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.

Also, I'm going to have to look at that post above referencing that the very first-gen PM G5 DOES have a PMU, and as such a PMU reset button as opposed to the SMU (which is reset by unplugging the computer for 15 seconds). Perhaps this is why the SMU reset procedure isn't working for some while it is for others.

The button, according to the web, is at the very bottom of the motherboard, under the processor fan assembly (a bit below the lower RAM slots). I'm going to have to crack mine open at home and see if this works--perhaps that's why the SMU "reset" I did didn't fix the issue...



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Something to Keep In Mind
Authored by: Steve_G on Nov 09, '05 06:15:40AM

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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Steve_G



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