IMac 24": crash/unbootable after airport express 2007-001 update

My iMac 24" (2.33GHz, Nvidia 7600GS) crashed when applying the update listed at http://www.apple.com/support/downloads/airportextremeupdate2007001.html
Video became corrupted, and underneath the garbled sceen appeared the grey "restart your computer" message.
So I did, it powered off. I powered it on again, and the screen remained "corrupted", see http://www.sevizeta.com/imac24corruptedscreen.jpg (the lower right corner has a 100% crop of the screen) and shortly after, the same "reboot computer" appeared underneath: http://www.sevizeta.com/imaccrashed.jpg.
I've tried:
- zapping the pram (Commandoption+PR keeping until the third reboot/chime) the same garbled screen "overlay" with the light grey+apple + circle progress, then the same "reboot computer" GSOD (Grey Screen Of Death?)
- resetting the SMC (unplug all cables, press power button for 15 seconds, plug power cord again, power on to no avail, the same happens.
- Restoring the EFI firmware: power off, press power button and keep pressing it: then the power LED blinks fast, then shuts off then lights slowly on again, the computer beeps, and nothing, no matter if the restoration CD is in or not, the same garbled screen with the light grey apple + progress circle, then GSOD.
- I have Bootcamp installed (and have successfully booted XP with no problems before). I tried booting XP pressing the option key at boot. The hard disks chooser appears, but after selecting the XP drive, then click on the arrow button to boot, the LED switchs off, and the screen goes blank (black) but the LCD backlight remains. No grabled screen.
- I tried booting single user. the screen remains garbled, but the CLI appears and is barely readable underneath. I try to keep on booting single user (sh /etc/rc) and it starts too boot until it freezes when launching mDNSResponder, but no GSOD however. see http://www.sevizeta.com/imacsingle.jpg.
- I tried booting single user, then fsck -fy, then CTRL-D to keep on booting. It gets stuck with a kextdwatchvolumes: couldn't set up diskarb sessions.
The only errors I see before that:
"GFX0: family specific matching fails"
"Previous shutdown cause: 3"
any clues?
iMac 24" 2.33GHz, NVidia 7600GS Mac OS X (10.4.8)

Update:
Booting in verbose mode showed no obvious hints about the crash.
Booting in safe mode (shift key at boot) made no difference.
Ran the apple Hardware Test, no failures neither in basic or extended tests.
Screen remained and is garbled.

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