IMac 27" (prod feb 2010) boot failure

Hi!
I have just bought a new iMac 27", produced feb 2010. I thought that all problems are solved. But after two weeks a have a boot problem: my mac shows the gray screen with apple logo and wheel. It happened after I was trying to switch user in Mac OS (nothing was happening, and I restarted mac).
I tried EVERYTHING, but none helped. I tried:
- to disconnect all devices
- to boot from DVD and perform Disk Check (no errors found)
- to boot in Safe Mode with Shift (unsuccessful)
- to reset power management
- to reset PRAM and SMC
- to boot in single-user (successful, but no changes) and verbode mode (unsuccessful)
- to make fsck -fy (no errors found)
I don't know what else to do. Please, HELP me! Technical support doesn't work now, but I need my mac alive tonight! Thank you!
One more question - is it possible to reinstall Mac OS 10.6 without lossess in files in my situation (I can't use Time Machine or smth else to back up)?

Thank you for your answer!
This is the last thing I will do, but I'm not sure in safety of such operation to the files stored in user profiles. As my mac is not responding, I'm not sure in anything.
I still trying to do smthing else in order to avoid reinstalling or formatting.
It's a pity that new macs have so many problems... I have old MacBook Pro and I had NEVER such problems))

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    HI JR,
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    Try this procedure:
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