On my G5 I have to hold that main power button down for almost 5 seconds before it starts to shuts down. Otherwise, it just goes into sleep mode. And it does take about two minutes to go through the shutdown process, ending up with a blue screen before the computer finally turns off. At least that's the way it happens in Tiger. Carter > I have a G5, and I am running 10.3.9. > I did run the Software update but I seem to be unable to update the > "Firmware Update 5.1.8f7". > > A window comes up: It tells me to shut down and to restart by > pressing the Power button.