iMac 27" high pitch noise

Joined
Nov 9, 2011
Messages
170
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Location
Yorba Linda USA
Your Mac's Specs
llci to Mac Pro "26 Kids" all named Mac
My older son has an iMac 27" Core i5. It has a high pitch noise some time with the brightness adjustment and sometime for no apparent reason. Anyone have this issue too?:Confused:
 

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