Mac G4 Won't Boot Completely After Restart

I fired up my Mac G4 and ran software update and installed the 10.4.11 update. When I restarted to complete the install the computer gets hung up -- a blue screen with the gear icon turning and turning. It worked fine before I did the update.
I've reset the PRAM to no avail. I've tried booting from the 10.4 install disc but that won'w work either?
Any ideas on how to get this working again?
Thanks!

Open the service door and press the PMU reset button from about a second, then see if the computer starts. (Ref: http://support.apple.com/kb/HT1939)
You can try a safe boot. Press and hold the SHIFT key until you see a message that the computer is starting in safe mode. When you see that message, t=you can let go of the key.
If this gets you a workable desktop, don't try to use any apps--their extensions are temporarily disabled. Try a normal restart to see if everything works.
I've found that by repairing permissions before and after doing a softare update, we've avoided update problems in all our OSX Macs.

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