QUOTE(ahmadcivices01 @ Dec 23 2010, 05:53 PM)
Thanks for ur INFO,NEW BIE here, today when i on my MacAir freeze during startup,already follow d instruction on HELLO manual book at chapter 3, problem, meet solution but still can't do anything,finally i make decision to reinstall my mac OS X, for info my MacAir 3rd generation just brought 2 week ago,any sifu here experience this before,can explain what happen exactly, start to love my MacAir suddenly this happen make me scare.

You can always call Applecare. You get 3 months free support with your Mac. I'm sure they can help you. A reinstall seems a bit drastic. I've only reinstalled OS X on my iMac once and it wasn't even really a reinstall. I was upgrading Leopard to Snow Leopard.
It'll be difficult for someone here to help you since we don't have much info to go on. There's about 103,000 things that can cause a MacBook Air to freeze.
Did you install any new software that might have caused it?
Can you startup in single-user mode?
It's important that you make sure it's not a hardware problem. If it is, get the Mac changed for a new one asap.