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Postagem original de: Micheal ,

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if it still doesent work after cleaning you can try a smc reset, it deals with charging and all kinds of other hardware, ive had it fix a failed USB port before.

1 Shut down the computer.

2 Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.

3 On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.

4 Release all the keys and the power button at the same time.

5 Press the power button to turn on the computer.

Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

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