From the Top: How can I fix my iMac after failed 10.4.3 update?

I have an iMac G4 (hemispheric base) with 512 extra ram (from Apple). I used software update to upgrade to 10.4.3 After an apparently successful download, the computer refused to reboot. It would get to the desktop (with my usual icons visible) but then the spinning rainbow wheel would never stop.
== I tried various combinations of rebooting and unplugging. No luck.
== I tried using the Mac OSX install disk to repair permissions. No change.
== I tried using the install disk to repair the disk. It said I had an unrepairable error on my disk.
== I tried booting in safe mode. Computer would always turn itself off.
== I tried booting in single user mode. It would show a text screen but not really start.
== I tried using disk warrior ($100). It performed a lengthy repair. Computer now behaves a bit differently (e.g. in safe mode it gets to the log in screen and then hangs rather than turning itself off and when I try to start as usual I still see my custom desktop background but not my icons) but it still will not start. Also, frighteningly, the disk drive will no longer accept the OSX install dvd -- it just spits it out.
So, I feel stuck. I need some of the data on the computer (including some digital photos of hurricane Wilma damage for insurance purposes) but even if I were willing to do an install and erase, how can I, since the computer does not accept the dvd anymore?
I know I should have fully backed up and repaired the disk with the install disk ahead of the upgrade. I naively believed the download to be routine. However, I do need the data and do need the computer. Can anyone help?
Thanks to everyone.

Hi
My Powerbook was the same. Only fix is to reinstall OSX from the install CD but be sure not to pick the Format and install clean. Once you boot with the install CD pick the preserve user data and settings.
On My machine the reinstall looked perfect. My network, email, files and all the programmes were all there. Most apps worked fine but Adobe CS2, Virtual PC and NetBarrier all needed reinastallation as they reported a few files or registration was missing. I went for the 10.4.3 upgrade again and it worked fine.
Good luck
D

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