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Very difficult 'Wake Up' from sleep mode

For the last several weeks my iMac (Retina 5K, 27-inch, Late 2015—Mojave) has been difficult to wake up after it goes into sleep mode. It takes jiggling with the on/off button in the back of the display and pressing on several keys. Sometimes it down't wake up at all and I must restart.

I have run Disk Utility.

Any ideas will be appreciated!

Ed in Brooklyn

Posted on May 10, 2019 11:03 AM