Mac Book Air doesnt boot up ?

I just bought my Mac Book Air few weeks ago. I got an error when opening 4 or 5 applications and then my Mac Book stoped work (Freezed) I used Force Turn Off by the button POWER. And then, when i open it again, it cant enter to Mac OS window. Just stay in Waitting screen( White screen with an apple and a circle rolling). I cant do anythings to resolve this error. Can any1 help me resolve this? thx

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Mac Book Air doesnt boot up ?

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