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Question: iMac doesn't complete startup

iMac doesn't complete startup. After the Apple logo appears, the progress bar gets to a certain point then the whole screen goes black. Have tried reseting system management controller and PRAM and also holding down the shift key.

Mac Pro, OS X El Capitan (10.11.6), MacBook Pro 15, Mac Pro, 500 MB SSD

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Question: iMac doesn't complete startup