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Message: <blockquote data-quote="MacInWin" data-source="post: 1836312" data-attributes="member: 396914">You should not power off the iMac with the button on the back (Hint: That's why it is ON the back, to make it slightly harder to do.) The operating system needs to close down certain things before power is removed. The  menu does that closure properly, the button on the back does not. It just removes power, leaving the OS wherever it is. It *could* be doing something important that needed to finish, but if power is removed, the system can be left unstable and even unable to boot.Safe boot requires that you hold down the keys, not just press them. That's about all the suggestion I can make--hold down the keys longer than you think you might have to.</blockquote>