One beep repeats and screen is unresponsive. What do I do?

My Mac book pro is unresponsive to any keyed action. It starts and begins to beep about five seconds apart and continues but nothing on the screen and the battery says it has full charge. What's going on? Please help if you can?

Now perform the standard troubleshooting steps:
Restart the device. http://support.apple.com/kb/ht1430
Reset the device. (Same article as above.)
Restore from backup. http://support.apple.com/kb/ht1766 (If you don't have a backup, make one now, then skip to the next step.)
Restore as new device. http://support.apple.com/kb/HT4137  For this step, do not re-download ANYTHING, and do not sign into your Apple ID.
Test the issue after each step.  If the last one does not resolve the issue, it is likely a hardware problem.

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