I have no sound from my macbook air

i got my macbook air for christmas, i have barely anything on this computer, but i notice that if i plug headphones in and then unplug i get NO sound from the computer??.. then i plug in the headphones and no sound there either =( . Do i need to take my computer back or am i missing something really easy?

Update to 10.9.2 ,   sporadic issue resolved from my testing.
upper- left ,     "software update"
10.9 and 10.9.1 in some instances would lose sound IF you sleep your Air with phones attached.
resolved from all indications in 10.9.2 just released couple days ago.
Peace

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