- 100% compatible with Mac OS X Lion - Downloadable update available through manufacturer's site to ensure complete compatibility w/ Lion New & Used (2). The wonders of our world are captured in this new 2011 edition of World Book. See how a killer tornado is.
- World Book Online is an engaging, verified, and trustworthy digital resource for grades pre-K through high school. Become a World Book Insider. Stay up to speed on all we have to offer-plus activities, crafts, and blogs for parents and educators in our newsletter.
- The 240,000-entry World Book Dictionary is a powerful language resource for home, school, and business from the editors of World Book. $4.99 Publisher: Software MacKiev Downloads: 227.
- The latest version of World Book Atlas is 3.1 on Mac Informer. It is a perfect match for Reference in the Education category. The app is developed by World Book, Inc.
Circle with a line through it
Learn what to do if your Mac starts up to a circle with a line through it (prohibitory symbol).
Latest Apple, Mac and iOS news, help and advice including Apple news, reviews, forums and buying advice.
Learn what to do if your Mac starts up to a question mark.
Blank (empty) screen
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Learn what to do if your Mac starts up to a blank screen.
Learn what to do if your Mac starts up to an Apple logo or progress bar.
Globe with alert symbol
A globe with an exclamation point means that your Mac tried to start up from macOS Recovery over the Internet, but couldn't. Learn what to do if your Mac can't start up from macOS Recovery.
If your Mac is using a firmware password, the lock icon appears when you try to start up from another disk or volume, such as an external drive or macOS Recovery. Enter the firmware password to continue.
System lock PIN code
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Your Mac asks for a PIN code when it has been remotely locked using Find My. Enter the four-digit or six-digit passcode to continue.
At the login window, enter your user account password to log in to your Mac. If FileVault is turned on, this also unlocks your disk. You might see a default desktop picture in the background, which might change to your chosen desktop picture when you select your account.
Thunderbolt, USB, or FireWire symbol
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A large Thunderbolt , USB , or FireWire symbol against a dark background means that your Mac is in target disk mode.
- Learn what to do if your Mac displays a message that it restarted because of a problem.
- Learn what do do if your Mac continuously restarts.
- When starting up from Windows using Boot Camp, your Mac doesn't show an Apple logo or the other macOS screens in this article.