10.5.2 Update Failed - Computer No Longer Boots from HDD NOR Leopard DVD

Hi. I hope someone can help me. I have one of the new 24" iMacs that has been working perfectly in 10.5.1. I started downloading the 10.5.2 update last night. About 130MB in, it said it had lost internet connection and stopped. I ran Software Update again and it resumed where it had left off, then said it had to be restarted to install, and went on its way. Then I got a pop up that said it could not be installed, or the install failed.
Now when I boot, it spends a long time on the grey screen with the apple logo and spinning disc. Eventually it turns to the blank blue screen and just sits there. Then I tried booting from the Leopard DVD (i figured i would just restore from my latest Time Machine backup and try the whole process again), except when it gets to the part of verifying that Mac OSX is on my computer it pops up with a system log and says I can't do anything. I can restart, shutdown, or save log.
What can I do?

When you tried again in the morning did you have anything connected to the computer apart from your keyboard/mouse? If yes, then try again leaving the computer to "cool down" - you could even remove the power cord. When you come to try again, only the power cord and keyboard/mouse should be connected - and to go the shortest route, press the C key immediately after hitting the power button. Keep the key down until something happens ...if you get a black cursor, you're in business and can relax for as long as it takes to boot from the DVD. Try not to give up - I believe that constant powering down and troubled restarts stress the machine, perhaps causing it to overheat.
If you do give up, try one more time to boot with the T key held down (again with nothing else connected) and if you boot into the Firewire logo screen, then connect a firewire cable to your other Mac and hopefully you will be able to get in.
Simon

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