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Release notes (client and server editions), update recommendations.

'The workaround I use is the same as back in the 10.3.x days: In Energy Saver Panel > Options, set Processor Performance to 'Highest.'' Index: I had logged the increased fan activity as a bug on Apple's Bug Reporter on Aug 18, Problem ID 4221599. 'I am a ADC Select member and went through the seeding of 10.4.3.

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Meanwhile, another reader who is a member of Apple's Developer Connection notes that Apple's Bug Reporter indicates 'increased fan activity' as an open, unresolved issue as of Mac OS X 10.4.3: I'm really disappointed about Apple because this is the same problem we got almost a year ago with Mac OS X 10.3.8.' But that's not a good solution for this problem. The only thing that helped was to set the CPU usage to 'minimal' (you also can use 'maximum') in the energy saver settings. Unfortunately none of your suggestions helped to solve the problem: neither resetting the SMU nor resetting the NVRAM. 'On my dual G5 with 2.5 GHz the fan activity also increased dramatically. Some users experience decreased fan activity when setting the processor performance at 'Maximum' or 'Highest' while others find decreased activity with the 'Minimum' or 'Reduced' settings. Resetting the SMU appears to have resolved both problems.'įailing an SMU reset, try starting up in Open Firmware mode (by restarting your Mac then immediately holding down the Command, Option, O and F keys simultaneously) then entering the following commands, pressing return after each:Ĭhange Processor performance settings In some cases, a workaround that has been successful in previous instances of this problem has also been effective: Using the Energy Saver pane in System Preferences to change processor performance settings. Follow-up on my last report of fan noise and keychain problems after updating to 10.4.3. The iMac is now starting normally but the fans are spinning very noisily and won't settle down. 'I have just applied the 10.4.3 combo update on my iMac G5. Resetting the SMU In some cases, resetting your Mac's SMU - system management unit (per Knowledge Base article #301733 for the iMac G5 or Knowledge Base article #300341 for the Power Mac G5) - can return fans to normal operation.

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I have seen Safari take close to 90% of each processor to download a 30MB file.' Since these are available to me at all times, I've noticed what some may have not - which is that during some of these periods of heightened fan use, the processors are working overtime for seemingly mundane tasks. 'In addition - I use MenuMeters status bars to measure the CPU usage on my machine. This is not consistent enough for me to report that it is always with the first application opened, but there seems to be some correlation. the first action I perform with the program (be it downloading a file, checking for mail, opening a file) causes the fans to go wild.

For instance, I will reboot (the fans may or may not start roaring at this point, but will calm down if they do) and if I open Safari, Mail, Photoshop, etc. Mine, however, seems to often happen within whichever application is opened first after booting up.

'On my Dual 2 GHz G5 (first gen.), the Mac OS X 10.4.3 update has caused the strange fan behavior that many have been discussing. MacFixIt reader Joe Rivera has some interesting observations about the issue. Did all the usual repair permissions before and after, no luck there.' 'Updated G5 iMac and now the fan runs at high speed constantly, great for cooling the processor, now approximately 31deg celsius.

Did the usual steps to see if I could fix it with no luck.'Īnother reader reports the same issue with an iMac G5: 'With the 10.4.3 update it is back to the 10.3 days when my legacy G5 Tower dual 2GHz fan would rev up for a few seconds for no apparent reason. When I say 'very high speed fans,' I'm talking jet-engine stuff, howlingly fast.' Very high-speed fans when opening Firefox, surfing to certain web pages (no discernible pattern or reason).

But no, the increased fan activity continued. At first, I thought the fan activity was caused by Spotlight indexing the computer, which includes the boot drive and two external firewire drives. Fans went nuts following the update (Powermac G5 Dual 1.8Ghz with 2Mb memory).

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'Installed Mac OS X 10.4.3 tonight through Software Update. In some cases, these increases in fan speed and audible volume are only temporary, and will diminish during subsequent operation. A surprisingly high number of users reported dramatically increased fan activity after installing Mac OS X 10.4.3.