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Black screen on wake from sleep


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I have been experiencing a very annoying problem since a week ago or so.  After waking up from sleep mode, the screen does not turn on. Although the keyboard and the os works. I have googled it and I have found a couple of people with the same problem, it all seems to point to a new security update Apple released with 10.9.3.


NB: A friend sends me this URL https://appuals.com/mac-black-screen-on-wake-after-sleep/ hope the problem will solve.


Edited by cryptcmer
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