Black screen during update OSX, no restart

During the last upgrade my MacBook Air screen became black, all is lock, isn't possible restart, the charger is connected, the light green.
Try all combinations of keys suggested but nothing happen.
Need help, I'm in Iraq now, there aren't apple store here.

1rst - Make sure that the computer is shut down before trying to restart it : Hold the power button for a good 10 seconds. That way you will be sure it is powered down. Then try to restart it.
2nd - If still nothing happens, try resetting the SMC by pressing [ SHIFT-CTRL-ALT (all on the left of the keyboard) -POWER ] at the same time for one second. This is 4 keys at the same time. Wait 5 seconds and try to start your MBA again.
Resetting SMC - http://support.apple.com/kb/HT3964?viewlocale=en_US&locale=en_US
If you still got nothing, there is a hardware problem with your computer. You will need technical assistance to resolve the problem.

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