MacBook will not Shut Down or Restart

My MacBook will not shut down or restart from the apple menu, nor from any other dialog box that pops up, after an update, for instance. The only way I can turn it off/restart is by using the power button. I have tried archiving and installing OS X, but I am still having this problem. Does anybody know how to fix this?

Hi Henry,
Help here: http://docs.info.apple.com/article.html?artnum=303319
Second, make sure you have all your updates. Click the Apple logo in the Menu then click Software Updates.
Reset PRAM by holding option-command-P-R keys down during startup until you hear the chime at least three or four times.
Resetting the PRAM is a standard procedure for the problem you are experiencing.
Also, run Disk Utility and Repair Disk Permissions. DU is located here:
Applications/Utilities. Launch DU, select MacintoshHD in the panel on the left, then click Repair Disk Permissions. Quit DU and reboot.
If you need further assistance, please post back.
Carolyn

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