SOLVED: MacBook Will Not Start Up After macOS Update. I have a MacBook pro running MacOS Mojave. For the past year or so, every time a new MacOS update rolls out, and is attempted to be installed on my MacBook, it ends up displaying the circle slash (Prohibitory Symbol). Rebooting still produces a prohibitory symbol. 13-inch MacBook Pro (non Touch Bar) Battery Replacement Program April 20, 2018. IPhone 7 Repair Program for 'No Service' Issues February 2, 2018. AirDrop is a proprietary ad-hoc service in Apple Inc.' S iOS and macOS operating systems, introduced in Mac OS X Lion (Mac OS X 10.7) and iOS 7, which can transfer files among supported Macintosh computers and iOS devices without using e-mail or a mass storage device.
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