I can't turn on my Mac Book Air after upgrade the Lion software. Please, can you help me?

I bought a Mac Book Air 3 month ago. I upgrade Lion software several hours ago. Later I reboot and I left to work. When I arrive, I can't turn on my MAC. Only light up the capital letter light, all the other parts are
dead o seem to be. Can you tell me what I have to do to solve the problem, please?

We can't, but Apple can, contact customer service, have your serial number ready and for a small fee Apple will send you a replacement.
If you're in a hurry, go to the Apple Store and purchase a copy of OSX ($29 in the US)

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