macbook pro went blank and won't turn on after latest software update ... help!
After software update, MacBook pro 15-in retina went blank and now won't turn on ... help please!
MacBook Pro with Retina display, macOS High Sierra (10.13), null
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Hold the power button for at least 15 seconds to be sure it is really OFF.
Then press the power button momentarily and report what happens. If nothing, it needs service.