Problems booting up after failed software update

Hi all...
I have an iBook G4 running 10.4.9. I just ran a software update, and a few things like itunes and iphoto updated fine, but the update to 10.4.11 failed. I restarted figuring I'd just try the failed update again after the reboot, but now it won't boot.
It goes past the grey screen, to the blue one with the window that shows the apple logo and "Mac OS_X" with a progress bar underneath.
The progress bar just sits there, and won't advance at all.
I'm just not sure what to do at this point... if the update failed halfway through and theres something messed up, or what... I'm not sure. Any ideas?

Please pardon the intrusion…
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