White Screen of Death (or coma, at least)

Hi everyone,
I've been searching all over the place for a couple of days and no solution to the following situation has worked as of yet, so any help would be greatly appreciated.
Brand new installation of Snow Leopard on a late 2006 24" white iMac with 4GB of upgraded memory. Everything is running smoothly (as has been previously under Tiger and Leopard before). I went on to try and give Boot Camp a go, so I create a (recommended) 32GB partition with the assistant and reboot. Windows XP starts the installer but it goes on to tell me that it's going to install on a 13XGB partition. I get cold feet and quit from the installer. Big mistake, it seems.
The iMac reboots, chimes and that's about it. No Apple logo, no Mac OS X, no Windows XP installer. Just a plain white screen. Now, I've read about similar situations in other posts, but nothing I've read has worked so far:
-> I've tried every possible start-up keys to force all possible boot modes, as per the documentation (single user mode, verbose, safe mode, etc.)
-> I've tried Target Disk Mode with no luck
-> It doesn't boot from any OS DVD I have (the original DVDs, Leopard or Snow Leopard).
Pressing "alt" on boot will give me a cursor but no drives, not even the DVDs. Pressing "c" or "d" will make the DVD spin for a while, but nothing more. I can put my MBP on TDM and it will show up on the boot screen when pressing "alt", but to little use. I've also done all this removing the upgraded RAM and restoring the original with the same results.
If I just let it boot without pressing anything, it'll turn off just by pressing the power button; otherwise (using some start-up keys) I'll have to press it some seconds to turn it off.
Now, if I could just get to Disk Utility or even the console, I'd be a happy man.
I'm now going to try to make a bootable firewire drive with the original DVDs or any OS version that's willing to be installed on an external drive, and give that another go, with low expectations. I can't think of anything else (except from opening it and getting the hard drive, which looks way more complicated that on the G5s).
Again, any help or pointer would be very much appreciated.
Thanks in advance,
Rafa

Ok, thanks to these two wonderful posts I got it to work:
http://discussions.apple.com/thread.jspa?messageID=5905884&#5905884
http://discussions.apple.com/thread.jspa?threadID=1143433&start=0&tstart=0
In essence: Get a working Mac and an external Firewire drive, boot a Leopard (for example) Installation DVD and install it on the External Drive (GUID Partition + HFS+). Attach it to the dead Mac and -here's the real trick- *turn on the dead Mac and keep pushing the power button until the led light flashes and it reboots*. That will make it use the external drive. The standard "alt" start-up will not work.
From there on you can use Disk Utility to recover your Mac.

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    Message was edited by: myhighway

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    Arnav Sharma | http://arnavsharma.net/ Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
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