My IMac computer is not rebooting. the spinning wheel icon which shows that the computer is rebooting, continuously spinning but computer ot starting

My iMac is not rebooting. The spinning wheel icon on the screen is continuously spinning but the computer is not starting. What should I do?

...and if you're still having problems try a Safe Boot: restart holding down the Shift key until you see a grey progress bar. Once booted, restart as normal from the Apple menu.
If none of this helps, what version of OS X are you running? We need this info in order to offer ideas for other measures.

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