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Helpful answers
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Jan 13, 2016 1:41 PM in response to Toxics1by alex_h1,Hello Toxics1,
Thanks for using Apple Support Communities.
I see from your post that you're not seeing any output on your external display which is connected to your iMac. To troubleshoot this issue please follow through the steps in the link below.
Get help with your Apple Cinema Display
Take care.
