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2387 Views 3 Replies Latest reply: Jun 5, 2008 12:20 PM by Pitcairn Mac
Hi, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
The pattern of fan activity is usually that there is a brief rev when the power button is pressed for Startup, and then the fans run at near to full speed for about 35 seconds while the system boots - and then OS X takes over fan control. The fan speed of the large Intake and Exhaust fans(that make most of the noise) varies with the amount of heat produced by the processors.
You can set 'Processor Performance' to 'Reduced', 'Automatic' or 'Highest' in System Preferences > Energy Saver > Options.
Please post again if you have any questions. Good Luck.
Hi Pitcairn Mac-
Greetings and welcome to the Apple boards
In addition to maclover's sage advice, and since it is used, do not forget the importance of cleaning the dust from the vents. In fact, it may be wise to open it up and look inside for dust buildup.
Dust buildup anywhere generally means more heat which will cause the fans to work harder in order to compensate.
-DaddyPaycheckA collection of clinking, clanking caliginous junk., Mac OS 8.6 or Earlier, Intellimini, Basement XServe, PMG5 DP2.7, 20" G5 iMac, G4's, G3's Gee Whiz