IMac G3 600 OS 10.4.10 won't start-only BLUE SCREEN?

I have an iMac G3 slot-loader 600 Graphite with 10.4.10 768 MB RAM 40Gig HD. It failes to start up. I get the white screen with the Apple logo and the small spinning sprocket. After 5 minutes, it goes to a BLUE SCREEN with the spinning sproket, then after 5 more minutes the mouse cursor appears only. You can move the cursor around the BLUE SCREEN. Tested RAM from another machine, and battery reads 3.7 volts.
Thanks!

Well, I'd try powering on with the shift key held down. This boots in safe mode which will run repair disk and skip loading of some software.
Mac OS X: Starting up in Safe Mode
http://docs.info.apple.com/article.html?artnum=107393
What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392
Yeah, I know you have Tiger, but this article is mostly relevant.
Your Mac won't start up in Mac OS X (Mac OS X 10.3.9 or earlier)
http://docs.info.apple.com/article.html?artnum=106464
I think something is wrong with the OS or the disk.
Robert

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