I am suddenly having a problem with my iMac - when I try to restart or shut down, it hangs on a gray screen, and I have to hard reset to turn it off.  How do I fix this?

I am suddenly having a problem with my iMac - when I try to restart or shut down, it hangs on a gray screen, and I have to hard reset to turn it off.  How do I fix this?

 
http://support.apple.com/kb/TS2570 Mac OS X: Gray screen appears during startup 

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