IMac shuts down after gray screen

I accidently unplugged my iMac while it was on. Now it turns on shows the gray screen with Apple logo then an empty progress bar flashes below the logo a couple of times and then it shuts off.
I've tried resetting my PRAM, unplugging everything from the USB port and disk repair. Nothing seems to work. I would like to be able to recover my files because unfortunately I didn't get around to backing them up.
Any suggestions?
Thanks!

You will need to start your computer with the original system disk that came with your computer and run Disk Utility, then click repair disk. I see in your statement your said your ran Disk Repair if it is the same did is show any errors on your hard drive. If it didn't find any errors then you may need to use something like DiskWarrior or Tech Tool Pro. Also try to start your system in safe mode, hold down the shift key will restarting your Mac.

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Hi,
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The following Knowledge Base article is a great resource for steps in troubleshooting spontaneous restarts:
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
http://support.apple.com/kb/TS4636
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IMac shuts down after gray screen

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