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Late 2015 iMac running Sierra freezes out of the blue

I have a late 2015 iMac. Replaced the HD with an SSD more than a year ago. It's been running smoothly ever since. Recently it has been freezing suddenly. I mean, COMPLETE freeze. Beach ball won't even spin. Everything is totally unresponsive. HELP!

Posted on Mar 2, 2018 5:18 PM

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Late 2015 iMac running Sierra freezes out of the blue

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