Trying to re install os x but just hangs at apple logo

I powered up the macbook air but it just shows question mark flashing, tried to re install os x but it just hangs at apple logo. I rebooted holding down Alt and it onloy shows USB drive. Done a Hardware test and it shows no faults. Any Ideas!!!!!!!!!!???????????

Time to make an appointment at your local Apple Store or AASP for service. You can try booting in the Recovery Partition by holding down the Option key when you hear the start up tone. Then run Disk Utility and attempt to repair the disk. If it comes up with errors after repairing the disk 3-4x then you know it's dead.
Good luck.

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