Macbook wont turn on After software update

PPlease help!
my macbook air 11 wont turn on After software update. The screen completely black . Power button is not responding éven if it is fully charged.
THank you
NOra

Have t you tried a SMC reset?
http://support.apple.com/kb/HT3964
It may be helpful if you indicated the EXACT MBA model you have and the OSX.
Ciao.

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    Please click the "Thumbs Up+ button" if I have helped you and click "Accept as Solution" if your problem is solved.
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