My macbook air 11 inch wont boot up. it is fully charge.  it was working last year.  what happen

help please

What happens when it tried to boot? Is there any screen display? If there is but it won't boot from the internal SSD, then I'd boot from the USB key and try to repair the SSD. If that doesn't work then I'd try to reinstall the OS.
If you are not getting any display any display I'd consider taking it to a local Apple Store to be looked at. It would still be under warranty.

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    Sky Sailing
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    http://www.anandtech.com/show/7113/2013-macbook-air-core-i5-4250u-vs-core-i7-465 0u/2
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    Welcome to the Apple Support Communities
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  • HT1237 Why does my MacBook Air (11-inch, Mid 2011) has the SMC version (1.74f3)?

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      Processor Name:          Intel Core i5
      Processor Speed:          1.6 GHz
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      Total Number of Cores:          2
      L2 Cache (per Core):          256 KB
      L3 Cache:          3 MB
      Memory:          4 GB
      Boot ROM Version:          MBA41.0077.B0F
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