Imac Wont Turn Off

Over the last few weeks my Imac will not turn off. When I shut it down it clears the desktop and then just leaves the wallpaper displayed, but never turns off. It eventually goes into sleep mode, but to turn it off I have to manually push the power button.

Do you have something hanging? Sometimes my browser will interfere. Do you get any kind of message?
In any case, try resetting your PRAM and see if that helps.

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