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Question: Attempt to dowload Apple free upgrade to Sierra and computer shut down-chimes and will not restart

Attempted to download free upgrade, from Apple, Sierra-went through the motions 1.5 hours later-states restart and I get the chimes and no restart-black screen-i have managed the CPR get in run disc utility many times and shut down restart and nothing again. I can only get a screen on CPR run disc utility states nothing found and Sierra icon faded out so I cannot reload. 21 in flat screen duo core all previous software downloads are current restore option attempted on WDC WD1001FALS-40U9B0 Media, ( whatever this is) and fails (null) error 254

MacBook Pro (13-inch, Mid 2012), OS X Mountain Lion (10.8.3)

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User profile for user: grammalinda

Question: Attempt to dowload Apple free upgrade to Sierra and computer shut down-chimes and will not restart