Problem imac 27

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hello

have little problem.
have imac 27 inch 2 months now.
great thing work on
week or have buzzing noise hear on top left corner.
hear distance?
when set sleep stops.
have video it
can som1 tell me if normal or ?

http://www.youtube.com/watch?v=bpduj...ature=youtu.be
 

does buzz sound change when adjust brightness?
 


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