White screen, does not boot

I have a 27" 2009 Imac that has been freezing up lately. Now I power up and I get a white screen with the apple logo and a progress bar. After about 1/3 of the progress bar is complete and maybe a minute or two, it powers off. I have unplugged everything and plugged the computer in again.
Any ideas?

Please carefuly read and then methodically follow the steps in Apples Mac OS X: Gray screen appears during startup located at http://support.apple.com/kb/ts2570

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