A few days ago, after my 12-inch MacBook running the latest Sierra became sluggish, I restarted. After entering my account password, my Mac showed a white progress spinner that uses “spokes”—the kind of spinner you usually see at shutdown—would appear for several seconds, then disappear, replaced with a cursor that couldn’t be moved with the trackpad. This would recur over and over for hours.

mac911 spinner foreverIDG

To every spinner, turn, turn, turn, there is a reason, turn, turn, turn.

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