My iMac will not load since a power flux

Today there was a power flux as i was using my iMac. I did not try to turn it on for 2-3hrs after the iMac screen went black as it turned off due to lack of power. Later i did try to turn the computer on twice, after unplugging it in. Each time I did turn it on the screen lights up with a white background, grey Apple logo, grey pinwheel turning, then switches to a white screen with nothing and the only response to a left mouse click is the rainbow pinwheel for a time, then nothing but a mouse arrow with the whte screen. The only way I can turn it off is by unplugging it since the power button does not respond.
Help, Please!

First work thru the steps at > Mac OS X: Gray screen appears during startup
Then if you get no where with that, go to > OS X: About OS X Recovery

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