Why does my iMac not shut down when I try to shut it down?

Wh does my iMac not shut down, or restart when I try to do either.  It just sits there with the little loading circle continuously moving.  The only way I can shut it down is if I hold down the power button to shut it down.  Can anyone tell me why this is?
Thanks!

Open your Activity Monitor and check to see what is running?
If there is some important Process running, then it is better to wait until it has finished instead of cutting the power and corrupting who knows what?
If there is nothing important running, then follow the instructions in the link below for resetting the SMC.
Intel-based Macs: Resetting the System Management Controller (SMC)

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