Today there is no sound both from build in speaker and headphone of my macbook pro

I need to restart twice and it comes back to normal.  Why?  Problem of bugs?

Hello kellylee,
I was researching the issue you are experiencing and came across an article that I feel would be helpful in isolating where the issue is happening. It is called Isolating issues in Mac OS X found here: http://support.apple.com/kb/ts1388.
You want to start here and work your way down if needed.
Is it a software or hardware issue?
Pay attention to important clues.
If the issue seems specific to a certain application or Mac OS X feature, troubleshoot software before hardware.
If the issue occurs as the computer starts up--unless the computer does not turn on at all-- troubleshoot software before hardware.
For other issues, or when software troubleshooting does not produce a resolution, use the rest of this document.
Take care,
Sterlin

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