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Feb 10, 2016 9:14 AM in response to ivanhorusby Allen A,Howdy ivanhorus,
I understand that you're having some trouble with your Mac's internal display when you've connected your iMac to an external display. While the article linked below may not seem particularly relevant on account of the title, the steps outlined should help stabilize your iMac, as the issue appears to only occur when an external display is connected.
Sincerely
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Feb 10, 2016 9:18 AM in response to ivanhorusby rkaufmann87,When you say the "last OS" please be specific, if you are not sure please click the Apple symbol in the upper left of the display and select About this Mac.
