Frozen iMac G5 - 17" Power PC

Hello all. After 2 years of never needing to do anything to this Mac, I'm staring at a blue startup screen and not getting further. Last night I found my Mac frozen after trying to access a desktop widget. After holding down the power button to shutdown and then restart the iMac, I got the grey Apple startup with the rotating clock looking icon. And that's all I saw for a very long time. After that, I finally started seeing the blue background on the screen, but that is as far as I'm getting.
Any advice on the next step? I only have a Bluetooth keyboard and mouse - just to make this more fun.

I too am having trouble starting up an iMac, approximately 2 years old, with the 3rd time with this problem. This time I did start from the install disk and repaired the permissions and the disk without any problems found. I also reset the SMU as the fan was running at jet-engine speed. The computer was still unable to restart from the local disk with just the grey screen with the spinning dial appearing.
The first time this happened, about 8 months ago, I reinstalled the operating system and it was fixed for about 2 months, then I had to wipe out the entire computer and start from scratch to repair whatever was wrong. It worked well again for a few months and now is all messed up again.

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