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Q: Recently, my mid2011 27" iMac began displaying flickering color squares on the monitor when accessing or activating graphics programs, i.e., CS6, Adobe Bridge or scrolling across the dock.  Thoughts?

Recently, my mid2011 27" iMac began displaying flickering color squares on the monitor when accessing or activating graphics programs, i.e., CS6, Adobe Bridge or scrolling across the dock. The graphics card is Radeon HD6770 512Mb. Anyone experience this behavior?

iMac, OS X Mavericks (10.9.5), 2.7GHz core 5; 12Gb RAM

Posted on Dec 18, 2014 1:06 PM

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Q: Recently, my mid2011 27" iMac began displaying flickering color squares on the monitor when accessing or activating graphics progr ... more

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