My mac book air doesn't always charge

my mac book air doesn't always charge. The charger doesn't always light up. Please advise.

unlikely your charger is bad, rather it sounds as if your IO BOARD may be defective, perform a SMC reset and re-verify same.
SMC reset
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. 
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
If same contact Apple for full in shop diagnostic and possible parts replacement.

Similar Messages

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    Can you clarify that?
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    reinstall from the original source
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    or
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    Hi
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    Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
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    Start up in Safe Mode.  http://support.apple.com/en-us/HT1564

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    Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support

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