Mac Air is dark and emits three short beeps/three long beeps/three short beeps ("SOS"). What does this mean?

Mac Air was left on power attached to a monitor overnight. In the morning there was a message that I had to turn it off by depressing the "on" key for over then seconds. I did this and it would not turn off. It is now emitting three short beeps followed by three long and three shorts ("SOS" in morse code). What does this mean?

http://support.apple.com/kb/HT2538
If what I read is correct, you will need to take your MBA to Apple to have its firmware restored.
I cannot explain why this happened.

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