MacBook froze while working, had to power it off, since then I can't boot any more.

Hello,
I have a MacBook Pro 13" from 2010. It's running Lion with all the latest updates.
Today I was surfing the web had several apps open and was chatting on skype. Suddenly I noticed Skype hung itself up, it said "Not responding" then 30 seconds later non of the apps would respond like it was all frozen. I could only move the mouse cursor. It felt like the system was overloaded. Another few seconds later also the mouse froze.
I gave it a few minutes hoping it would come back but nothing.
So I held down the power button to turn if off.
I restarted and when it's booting I see the white bar, as if it's trying to recover from the last crash, but about 10 seconds into booting, it just turns completely off. I never even get to the login screen. I left the laptop off for a few hours. I tried again, same thing over and over. Laptop completely turns off after about 10 seconds into booting.
I also have windows 7 installed over bootcamp, so I tried loading that, works without probem! I am writing this post from Windows 7 now. I opened up windows explorer and had was browsing through the Mac partition, it all works, I get full read access. Guess it's not a hardware issue then -phew!
I have no idea what I can do to fix that problem since I can't even get to the login screen.
What can I do?
Can it be a Kernel error? Or some kind of error while it tries to recover from the last crash?
Is there any way to tell Mac not to try to recover from the last crash and just to a clean boot?

Will repairing the internal HDD delete access to Windows 7? that's that I am worried about, because if it deletes the windows partition and won't fix the mac partition, then I am screwed, then I can't boot into anything.
A Backup of my files? Well I do use DropBox to live sync my Music, Picture, Documents and Project folder. However there are files on the desktop and probably some apps and related files in the Application Support folder which I'd like to backup. And since I have full read access from my wndows partition to my mac partition I will just back then up now.
How big are the chances that the Disk Utility will break access to the Winows 7 partition?

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Was working now not, Can not boot any more system error

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A +Summer 2001+ iMac G3 cannot boot Mac OS 9.0.4. It came pre-installed with 9.1.
http://www.everymac.com/systems/apple/imac/stats/imac600graphite.html
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Try resetting PRAM.
http://support.apple.com/kb/HT1379
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Reboot the iPad and see if that helps.
Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.

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Do you have a 15" mid-2010? If so then your problem is surely...
Mid-2010 15" MacBook Pros - the bad NVIDIA GPU
If you're having frequent kernel panics with your 15" mid-2010, or intermittent screen problems, the problem is, more than likely, the faulty NVIDIA GPU found in a number of those machines.
Here's just a sample of a kernel panic log that points to the faulty NVIDIA card:
Kernel Extensions in backtrace (with dependencies):
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            dependency: com.apple.NVDAResman(6.4.0)@0x834a0000
            dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x82fd3000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x7a802000
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Clinton

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MacBook froze while working, had to power it off, since then I can't boot any more.

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