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Helpful answers
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Oct 31, 2013 9:40 AM in response to Valerio_by PlotinusVeritas,reset SMC
- Shut down the computer.
- Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
- On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
- Release all the keys and the power button at the same time.
- Press the power button to turn on the computer.
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Oct 31, 2013 10:46 AM in response to Valerio_by dominic23,Press and hold the power button for a while for the dialog box to pop up
or hold control key and pree power button.
When the dialog box appears
press r for restart, u for shutdown and s for sleep.