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the other day i open my MacBook Pro mid 2012 for upgrading my ram, everything was ok, but when i closed it i notice that when i close the lid nothing happens. The apple on the lid remain on and the mac continue to work even if there are no apps opened.

It is possibile that i've touched some sensor when i opened it?

If i click the power button it goes in sleep mode normally.

EDIT: It's doesn't work even in SAFE MODE

  • Does the output of the Terminal.app command pmset -g log provide any clues or list any recent errors? – Graham Miln Jan 7 '14 at 10:57
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Just found what was wrong. It was the connector to the mother base which wasn't well connected.

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