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It's a 13" late 2009 model and I never had this problem up until now. Also the stop action from the  menu doesn't seem to work.

(I have installed Caffeine but I don't think it's the problem because the macbook won't stop even if the application is closed.)

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Do you mean "sleep" instead of "stop"? – CajunLuke Mar 12 '12 at 15:40
My system language is italian, is the default action performed when closing the lid called "sleep"? – Francesco Mar 12 '12 at 19:12
Yes, in English, it's called "sleep". I assumed you were doing a direct translation, so I didn't edit your question. – CajunLuke Mar 12 '12 at 19:24

Create a new user account. Log out of your current user and into that new user. Close the lid or use the apple menu.

If it sleeps, it's an application running in your user account that's preventing sleep from happening.

If it doesn't, it's system wide, maybe even a hardware problem.

Need more information :)

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