2012 MAC BOOK PRO HAS BLACK SCREEN
MY 2012 MAC BOOK PRO SCREEN IS BLACK. HOW DO I REBOOT OR FIX IT
MacBook Pro
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There are two articles from Apple support that have details and clues
which may be helpful if their content were used to resolve this issue..
• If your Mac starts up to a blank screen - Apple Support
//support.apple.com/en-us/HT210905
"A blank screen (black, gray, or blue) should appear once or more during startup.
..If your Mac appears to be stuck on a blank screen, follow these steps.."
• If your Mac starts up to an Apple logo or progress bar - Apple Support
//support.apple.com/en-us/HT207019
Other ideas may be among potential answers suggested here:
•Apple Support article: If your Mac doesn’t turn on
•Apple Support article: If your Mac doesn’t start up all the way