I had to go through many obstacles to get it working. What finally fixed my Finder crashing on logon was booting with the Leopard disk, deleting all my preferences using terminal, running fsck, zapping the PRAM, so I could finally get disk utility from the install disk to repair permissions. It was hanging on repair permissions.
Then it finally booted....into Mac OSX 10.5 setup assistant! I thought it was odd but I filled it all out...and then it looped back into setup assistant!
So I followed the tips I found online saying to startup in safe mode, NOT login, click the back arrow once, then the updates installed...took about an hour for the update progress bar to get anywhere....
But finally I have a fully functional iBook G4 running Leopard. Gotta figure out how to back up all my files (documents, photos, music, videos) somehow. Because I think I need to unbloat the system with a clean install. Lots of old crap apps in there.
And yes the RAM is maxed out. I'm thinking of putting an SSD in there to replace the 60GB HD.