G4 will not re-boot after security install

I did a security update install this AM. Tried the "restart" after install was complete. Got funny blinking screen. Powered down and tried to re-boot. Get the grey "apple" screen and spinning gear. Get the blue screen and loading bar...then nothing It locks at that point. Tried Disk Warrior and Norton. They both said "no can do". Tried reloading operating system from CD. Also, no can do. Hard to believe it's hard disk problem since it was working fine just before the update.

I'm having the same problem, except it won't get past the spinning gear.
I've tried resetting the PMU switch, starting up from restore CD, hooking it up through firewire to my laptop, resetting PRAM and NVRAM. Nothing works.
I also ran the Apple Hardware Test, and everything seems to be working ok.
Has anyone solved a similar problem or have any suggestions? Thank you!

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Thanks for checking in, BDAQua.
Problem solved.
In the docs that came with my Powerlogix accelerator card, I found this sentence buried:
"If you reset the PRAM, the NVRAM code for OS9 compatibility is cleared, so you will have to boot from the Firmawre Update CD and perform this process again in order to boot in OS9."
The "process" it's referring to is the process of setting up the NVRAM for booting into OS9 from the CD.
Fortunately, I was able to find the disk, and it worked as expected. I can now, once again boot into OS9.
Conclusion: My (unadvised) attempt to load Leopard on this old machine apparently reset the PRAM on the accelerator card and cleared the NVRAM code for OS9 boot. Although I did attempt to reset the NVRAM via Open Firmware, it did not reset it on the accelerator card.
So, thank you BDAQua, for your "Ah yes" . . . that's all I needed to steer me in the right direction.
Gratefully,
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G4 will not re-boot after security install

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