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View Full Version : PowerMac G5 Dual 2.7 fan problem - PLEASE HELP!!!


powermac_daddy
Nov 18, 2005, 08:59 PM
I have a G5 Daul 2.7 with 2g of ram (OX 10.4.3). I do a lot of vectorworks 3D rendering ( architectural )on this puppy. I have noticed a problem lately: The fan stays on after i wake up the computer. I don't think they are the processors' fans, i think it might be the fan that with the speaker. I'm not 100% sure. Well, the fan would stay normal if i restart the computer. The fan problem only occur after i awake the computer from the sleep mode.

Can someone help me? Any suggestions? Feel free to drop me a line on aim: mrdingliu
Thank you very much for reading my post.

FFTT
Nov 18, 2005, 10:45 PM
The last 10.4.3 update has caused quite a few quirks including extra fan activity.

Mine seems to ramp up every once in a while now too but only for a moment.

Apple already has OS X 10.4.4 in the works and it should help with some of these issues.

You might also want to check macfixit.com 10.4.3 threads about fan
and sleep issues.

If you have Vectorworks set up to run as a start-up item, then that might also be the cause of the fans running when you wake from sleep

It's just reloading the application to get ready for work.

Will Cheyney
Nov 19, 2005, 03:18 AM
After updating to 10.4.3 I too suffered from excessive fan noise.
Here's how I fixed it (I did a little research on this board and at www.macosxhits.com).

1.
Open the Energy Saver System Preferences panel, and click the Options tab. Click the Processor Performance pop-up menu, and set it to either Highest or Lowest -- anything other than Automatic. Close the panel, and you're done. Not wanting to give up any performance, I set mine to Highest.

2.
This will keep your G5 even quieter. It will also eliminate any annoying beeps or chirps that can he heard from within during certain processes.

The solution to the chirping problem is to disable "CPU napping." From my understanding of it, this is a lower-power mode for the CPUs, invoked automatically by the G5's power management functions. The G5 wasn't designed to be a 'power conservator' so you may ask yourself what the pint in such functions is. You need to install CHUD, which is short for Computer Hardware Understanding Tools. If not already installed, you can get it straight from Apple, here: ftp://ftp.apple.com/developer/Tool_Chest/Testing_-_Debugging/Performance_tools/. Download the most recent version (which is 4.2.3 I believe). After installation, look in the Other section of System Preferences, and you'll see a new Processor panel (I think it's called Hardware in 10.3). Open that, and uncheck Allow Nap.

Also note that if you restart, the nap setting is reset, so you'll need to re-open the prefs panel to fix it again. Alternatively, this older hint (http://www.macosxhints.com/article.php?story=20040601142834620) explained how to use a simple AppleScript to enable the nap setting at each restart. Change the =1 to =0 in the script, and you should have a "nap disabling" startup item (though I haven't tested this).


Hope this helps!

powermac_daddy
Nov 19, 2005, 01:01 PM
i had that set up... i'm seeking other solutions.
thank you very much for the help Will.