I have an iBook G3 that won't boot up. Everything seems to load just fine, until the screen that has 'Login Window Starting' on it. It seems to boot past that point, but all I can get is the blank blue screen. The pointer remains onscreen, and I can move it around, but that's about it. No icons; no desktop; no nothing.

I've tried running fsck -fy and it says the Hard Drive is OK. I've tried putting in the OS disc, but it doesn't do anything. The tray tries to spit the disc out, and when it will stay in there it doesn't do anything. I've also tried booting in safe mode, and it won't do that, either.

You should be able to clear this by running some disk utilities. You cab boot in target mode by holding down the "t" key during boot and connect to another PPC OSX mac via a firewire cable and running a disk repair from the Disk Utility on your drive or use a third party bootable utility like Disk Warrior