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iMac randomly waking up with a gray progress bar

I have a new iMac 5K. I noticed a few times that my iMac will randomly wake up with a gray progress bar on the screen. I've never seen this kind of bar on a Mac before. Please help. image is attached.User uploaded file

iMac with Retina 5K display, OS X El Capitan (10.11.3), null

Posted on Feb 1, 2016 9:49 PM

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iMac randomly waking up with a gray progress bar

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