Ever since the 10.4.3 update, kernel_task with PID 0 as root process has been running usually above 50% of the CPU when the machine is at idle. I have a 15" Alum G4 1.67GHz Powerbook. Its getting really annoying that it is always running when nothing is happening. sometime is I let it run, it will eventually go down to below 1% but not until after a couple of hours. Can someone help me fix this, or is this a fix for the next OSX update? Thanks in advance.