Ran out of startup disk space on 10.4.8 update, now KP at startup

[blusubaru]

Well, I think I shot myself in the foot with my MacBook. I forgot that I had meant to clean house on the startup drive and clear off some room before doing the Pro Apps update and 10.4.8 update. It was installng the last bit of the OS as I was hurridly trying to find things to delete when it ran out of disk space. The finder locked up trying to empty the trash, and I got a red exclamation mark on Software Update. Now, every restart results in a KP before the OS even loads. FW disk mode to my G5 iMac lets me access everything just fine, DU run on MacBook via FW Target checks out all good, starting MacBook from OS DVD and running DU there checks out fine. What else can I try?