CAnt Shutdown or Reboot my Air

hi folks,
i recently got an (already used) macbook air and i have quite some trouble with the tiny one:
-i cant shutdown the air like my other macs-the display remains black, the computer starts working, but if i close the display, the lid is lighting permanently. when i try to restart it with a simple pressing on the power button, nothing happens. it just boots again, when i hold it down for at least 5 secs and then restart the whole thing.
-same thing when i try to reboot the machine.
has anyone else occured those symptoms on an air? has anybody a idea how to fix that?
i would be so thankful, as i really loose my nerves with that thing...
regards and thnx in advance
chris

Not sure if its the same, but I've had the same problem where I can't shutdown using either the power button or the menu - it says its shutting down but it doesn't.
My solution was to open the Console app and type:
su - <admin name> (you might already be an administrator, I'm not)
shutdown -r now
This worked - so nothing wrong with the unix underneath but something to do with a process blocking the UI?

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Which one did you install? You have to run it before you can see the icon:
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Sáb Out 25 19:43:31 WEST 2014 - 2 min
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Sáb Out 25 19:43:31 WEST 2014 - 2 min
Sáb Out 25 19:44:27 WEST 2014 - 3 min
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-- Logs begin at Sex 2014-10-24 22:02:03 WEST, end at Sáb 2014-10-25 20:05:29 WEST. --
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