Macbook unable to start

Asked December 27, 2013 at 6:42am by qamarmand | 1789 views | Mark as Spam
Hi there,,, my macbook after recent update is unable to start,,,, i grey colour screen visible and a bar start to complete with spining gear,,, after completion it automatically turn off,,,, i have my much precious data inside also,,,, what should i do now, seeking hlep! REGARDS:
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