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).
Primal Carnage: Extinction, free and safe download. Primal Carnage: Extinction latest version: Hunt Dinosaurs or be Hunted by them. Take aim on the bi. Ghost Recon is a first-person tactical shooter. You can choose one of four characters: sniper, rifleman, demolitions expert, and support expert, with specialists being unlocked as you complete the single-player missions. The Mac version combines Ghost Recon and the first expansion pack Desert Siege.
Question mark
Learn what to do if your Mac starts up to a question mark.
Options with a gear icon
Learn what to do if your Mac starts up to Options with a gear icon.
Blank (empty) screen
Learn what to do if your Mac starts up to a blank screen, such as an empty gray, black, or blue screen.
Apple logo
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.
Lock icon
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
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.
Login window
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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.
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Thunderbolt, USB, or FireWire symbol
A large Thunderbolt , USB , or FireWire symbol against a dark background means that your Mac is in target disk mode.
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- Learn what to do if your Mac displays a message that it restarted because of a problem.
- When starting up from Windows using Boot Camp, your Mac doesn't show an Apple logo or the other macOS screens in this article.