MacBook Pro with built-in speaker with weird problems

Suddenly after a while my built-in speaker is not working properly, I can hear the sound but it is not clear and clean as before. Now there is a blur sound.
MacBook Pro (Retina, 13-inch, Late 2012)

For starters... if you launch PhotoBooth or FaceTime, does the camera work?  If you're trying to use it on a website, many sites access the camera via Flash.  You would need to download and install Flash from Adobe:
http://www.adobe.com/shockwave/download/alternates/
(select the OS X installer)
If your camera is not working with PhotoBooth or FaceTime, let us know.

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