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Apple's line of laptops for professional and power users. To date, the MacBook Pro line includes 13, 14, 15, 16, and 17-inch variants, with major revisions defined by Pre-unibody(Original), unibody, Retina display, Touch Bar, and SOC (system-on-a-chip) designs.

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Displaying error sign on white screen

What does it mean that my screen is white with a circle with a line through it in middle?

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Restarting with recovery method did not work.

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Trying to boot from a system that is to high or to low for your machine. What machine are you running and what system?

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I have a MacBook Pro 2009/2010 running with all updates. I believe using OSX. I can't get on there to say for sure.

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To start your computer from Recovery, restart your Mac and hold down the Command and R keys at startup. Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window with the options listed

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Patricia Gress will be eternally grateful.
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