I have a G5 and recently updated to Tiger. I've done all the updates, and now the computer freezes. If I leave it on in a few hours, if I click on a program in the dock, it just bounces for ever, and then the mouse turns into that multi-colored circle, and the only way out is to hold down the power button. It even does this if I am not using the computer so it's not any specific application that I am opening. I've tried repairing permissions, and that didn't work.I've gone through all the basic trouble shooting steps, and still nothing is working. I'm wondering if maybe there is something running in the background that I don't know about that is causing this. I've checked the crash logs and they only report that the computer was turned off unexpectedly, not that there were any errors or problems. What would cause the whole Mac to freeze?