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Found this link http://answers.microsoft.com/en-us/windows/forum/windows_10-power/black-windows-after-sleep-mode-windows-10/950a07db-ed74-49de-a0b5-3d284c2ff8a8 which also talks about Microsoft.LockApp.exe hang associated with black screen after sleep. But still have no clue for solution or...

Did you figure a solution earlier? I have exactly the same symptom "Windows button buzzes and keyboard lights up bit black screen..." Really need to find a solution for this. I am even thinking of returning the S3 (it is only two weeks old)! Doing a forced shut down and a start does not makes...

Since yesterday, I ran into the issue of S3 not waking up after going to sleep. Pressing the Power button only brings up a dark gray screen which after a while goes completely dark. May be a coincidence but it started to happen after the Microsoft Windows update (KB3116908) got installed. This...