MacBook Air 11" mid 2012 black out

Question

MacBook Air 11" mid 2012 black out

My sister has a MacBook Air, 11" Mid2012 and lately she faced a problem with it. When she puts it on charge (regardless of the level of the charge), after more or less 10 minutes, the computer shuts down itself out of nothing. At this point you cannot make the computer work in any way, she even tried to turn it on again pushing the start button, but after some noise (I think the noise comes from the fan) nothing moves. After couple of minutes, the mac turn itself on magically. I really cannot figure out this weird behaviour and the thing that is even weirder is that sometimes the desktop image is formatted in a different way than before.

Have any of you faced a similar problem?

Thanks

Jacopo

MacBook Air (11-inch Mid 2012), OS X Mountain Lion (10.8.5)

Posted on Nov 21, 2015 4:46 PM

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Answer 1

John Galt

Level 10

141,150 points

Nov 21, 2015 9:18 PM in response to Jacopopitaciu

Power or other problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset. Read all the steps.

Before Resetting the SMC

Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.

Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.

Resetting the SMC on portables with a battery you should not remove on your own

Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if it's not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. The power adapter indicator light may cycle off / on once.
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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