I have also aspire 5520. If I press / choose shutdown, and after press Ctrl+F7, 
usually the last message on screen is 
"halt: Unable to iterate IDE devices: No such files or directory". That means 
that problem is bug 298402 ( https://bugs.launchpad.net/bugs/298402 ).

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Acer Aspire 5520 laptop does not shutdown correctly
https://bugs.launchpad.net/bugs/363654
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