Why my macbook air stopped working and started beeping?

I was working with my macbook air, but sunddenly it stopped working and started beeping. why this happend?

What sort of beeping?
Intel-based Mac Power On Self Test RAM error beeps
Power On Self-Test Beep Definition - Part 2

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    Dr. Smoke
    Author: Troubleshooting Mac® OS X
    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
    I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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