I recently upgraded my wife's computer from 10.4.8 to 10.4.9, and since then, when powered on the fans are on continual full speed. If I do a warm reboot after the initial boot, fans operate normally. Her computer is a dual 2.7 Ghz G5 tower. Keyboard and mouse are the OEM units that shipped with the computer. No other accessories are attached. TIA for any pointers. Jerry K