Macbook air shuts down after starting to boot up

My mac book air starts to boot up (the wheal starts to turn for about 30s) than it just turns of
it was working fine a few hours ago, i did a hardware test (every thing was OK) and after that the problem occurred
PRAM Reset did't help
Message was edited by: Zabranjeni

Get a USB external DVD drive, boot from your install disc and try repairing the drive with your Disk Utility. If that does not work, try DiskWarrior, short of reformatting the drive and losing all your data.
Dave M.
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<Personal Information Edited by Host>

Macbook air shuts down after starting to boot up

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