My mac doesn't shut down

hello everybody ,
  my problem is when I click shut down from apple menu , my mac goes to the blue background with the loading picture and it doesn't turn off until I press the shut down kay one the keyboard.
I've used Onix and CleanMyMac to clean my mac but did not matter
I'm in 10.7.4
thnx

Make sure and quit all your open applications before shuting your Mac down.
I've used Onix and CleanMyMac to clean my mac
BTW, third party cleanning utilities are not necesssary on a Mac and can cause more harm than good.
Your Mac runs maintenance for you.
How to Uninstall CleanMyMac? | CleanMyMac Knowledge Base | MacPaw
To uninstall Onyx, open Onyx.
Now click the Apple menu icon top left in your screen. From the drop down menu click Uninstall Onyx.
If you continue to have problems, use Lion Recovery  to repair the startup disk if necessary, or reinstall the Mac OS X.

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