HT201541: Update the software on your Mac
Learn about Update the software on your Mac
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Helpful answers
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Nov 1, 2015 1:20 AM in response to audra411by GhonaZ,You can try a SMC reset https://support.apple.com/en-us/HT201295
Make sure to choose the correct macbook type (your macbook air is a mac notebook with non removable battery).
See if it helps. If not please report back