Won't start up.. blue screen

My wife did a software update last night, (her ibook G4 is on 10.4), and now the iBook won't start up. We get the grey screen and the Apple symbol then after a while it goes to a Blue screen, then just stays on a blue screen.
I've reset the PRAM and I connected to my MacBook and ran disk repair and permissions but still the same issue.
any help out there?

Checkout Mac OS X 10.4 Help: I see a blank blue screen when I try to start up my computer
and "You see an empty, blue screen. You might also see a progress indicator, which looks like a colored pinwheel or spinning disc".

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