At 8:40 AM -0700 10/31/2011, JOHN CARMONNE wrote:
Yesterday I swapped out some RAM and moved a couple of HDD's from one bay to another in my G5 Dual 2.7 and after booting up my fans ran fast 3200 rpm, constant and the processors where right at 100% usage with nothing but Mail and Camino running. I shut it down and ran ASD 2.5.8 along with the Thermal Calibration drill and no problems were found. So I booted it back up and after about an hour the fans calmed down and both processors came down to normal. about 10% with a browser and Mail. Does anyone know if my RAM and HDD swap would do this?
After making hardware changes, sometimes the power manager gets confused, so it ramps the fans - better safe than sorry. If it happens again, reset the PMU/SMC.
The only other reason to ramp the fans is because you need the cooling. Make sure the air flow is good. Or it could be that something was running that was generating heat - such as Spotlight, as the other replies suggest. A look with Activity Monitor can be helpful.
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