Can't shut down or restart

Hi folks,
When i press the power button ususlly a dialog comes up. Restart, sleep etc.
As of a few hours ago when i press the button nothing happens.
When i select shut down, restart or log out from the  menu nothing happens either.
I ran disk utility and diskwarrior but it still wont work.
If i press and hold the power button it does force shut down so the hardware works.
I am leaving on holiday in the morning and as it's 1AM now i really dont want to resort to re-installing my entire mac.
Does anyone have any ideas or suggestions, you would save my vacation!
Thanks
Jay.

Got the issue.
Onyx's option to hide the sleep, restart and shutdown buttons in the login window...
actually disables any and every way to do those things on ur mac.
beware.

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