Thread: Noise issue
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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 39,366
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

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Machine is new? Take it back or give Apple tech support a call. The hissing noise when running on battery is a concern. High pitched whine when brightness is turned up is something I also experience when using my 22" Samsung external monitor. I'm not sure what causes it but I suspect it's the monitor backlight - especially at high levels of brightness.

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