HT201800: Apple Cinema Display: Troubleshooting steps
Learn about Apple Cinema Display: Troubleshooting steps
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Oct 29, 2014 10:32 AM in response to easthillsby Johnb-one,Okay, Mr. Easthills, you have an imac, but yet you mention apple cinema display....Hmmm, curious. you could try zapping the PRAM, hold down command (apple?), Option+P+R keys while rebooting mac. Hold down for 3 chimes, then let go and boot normally. I have this problem too, and I have a 20" widescreen apple cinema display(DVI connector--did I just date myself or what?),anyways, it's behaving itself now okay, but it tended to go dark right in the middle of whatever I was doing, and only unplugging the power cord to the display, and replugging in it would fix it for a while. sometimes it would happen again, and again the same solution. As to why it happens now with Yosemite, I don't know . This dear old monitor has lasted me about 8 years and it's still going just fine.. not state of the art anymore, though...
oh well, good luck to you
John B