After install Mavericks I can't turn off my MacBook Pro from the power button.

Dear all, prior to install Mavericks in my MacBook Pro, when I pushed the power button it appeared a dialog box which gave me the option to turn off the copmuter choosing the right option.
After the installation of Mavericks,and obviuosly having the system running, when I push the power button it does just nothing.
Does anyone have the same issue? Have someone solved it?
Thank you very much in advance for your answers, for your attention and for your help.
Kind regards.

You can turn off this new sleep feature and restore the shutdown/sleep dialog box  to pop up when you press the power button.
In Terminal copy & paste in the following command and then press enter:
defaults write com.apple.loginwindow PowerButtonSleepsSystem -bool no

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