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IMac super slow and now will NOT boot up

Update:10-11Source: network consolidation
My iMac G5 (non-intel, non-isight) has been slow for a few days. I've tried to isolate it to an application but couldn't really find anything. We didn't install any new applications before it started slowing down.
So I ran software update, installed 10.4.8, shut down, and then it never restarted! It goes to the gray screen with the Apple mark and the little circle loading indicator. But it gets stuck there.
Apple Care is closed for the weekend so I need help. Help!

The Best Answer

To Apple Discussions!
Which model G5 iMac with no isight? How to identify your iMac
See Mac 101-Lesson 2: Startup Setbacks.
Click on the topic link(s) that pertain to your issue(s).
Good luck!