My Macbook Air 11" Won't Turn On!

I didnt use this macbook for one month. Today, when I press the power button, it cannot turn on. The display is black and dont hear any sound.
I pluged the charger. The charge light is green (which shows the battery full). But I don't believe a laptop unused for one month still has full battery.
Any ideas?

One standard thing to try is Resetting the System Management Controller .

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