While the system would wake properly if immediately put into sleep and then woken, if left in sleep mode for a prolonged time, then it would simply refuse to wake up. wrote in about this problem happening on a Late 2013 model iMac, running the latest versions of Yosemite and all other installed software. With this problem, affected systems require either the power button be pressed and held for ~10 seconds, or the power cord is pulled to shut the system down and reset it. There may be an issue that some iMac users experience where after being in sleep for a period of time, their systems will no longer respond to keypresses or other input, and even though pressing the power button should similarly wake the system, doing this similarly has no effect.
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