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harryb2448

 
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Member Since: Nov 28, 2007
Location: Nambucca Heads Australia
Posts: 17,413
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Mac Specs: iMac i5 2.7GHz OS X.9.4 and OS X.10

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Sounds like flyback problem and the CRT is on the way out. Have a look at this link which has some suggestions:-

Sometimes, my monitor will make a high-pitch sound that gives me a headache. How can I stop it? - Yahoo! Answers
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