What do I do when my MacBook Air (refirbished) sometimes turns on and sometimes does not when it is in sleep mode and when I turn it off?

I got this refirbished MacBook Air sometime in the last week or two. Now lately, when I turn it off or put it in sleep mode, then try to turn it on; it will take a long while to turn on or it will turn on normally. Can anyone help me?

Try a SMC reset.
http://support.apple.com/kb/HT3964
If no success, bring the MBA to an Apple store genius bar for a FREE evaluation.
Ciao.

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