Gray Screen and won't start up

I shut down my mac last night because we were expecting storms. I tried to start up this morning and it chimes and then the screen goes a light gray. It is not showing anything on the screen - no icons, no little weird folder - nothing, just a blank gray screen.
I have pushed the power button and it goes black (like asleep) then push the button again... it chimes again and then the screen goes gray. I have done this several times. Then I turned it off, unplugged it from the outlet, plugged it back in and tried again with the same result - blank gray screen.
I am freaking out because I am in the middle of several major projects and I need to be able to use the computer today. Right now I am emailing from an older mac that I have in my office.
Any help would be appreciated.
Thank you.

Your welcome!
Now look at: *System Preferences > Startup Disk* and select the 10.5.6 on Macintosh HD then lock the preference.

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