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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).

Question mark

Learn what to do if your Mac starts up to a question mark.

Options with a gear icon

Mar 23, 2018 Unfortunately, any Mac user may encounter a problem when the device does not turn on and stucks on the loading process. It usually looks as follows: the computer starts to load, the Apple logo appears on the screen, but nothing happens afterward – the system does not boot up, and the device does not react to anything except forcibly pushing the power button.

Learn what to do if your Mac starts up to Options with a gear icon.

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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.

Mar 06, 2020 My MAC Mini will totally freeze up, sort of. In other words, I can have 2 windows open, the first e.g. Is playing a Youtube video, upon opening a 2nd window, it freezes to the point where I can no longer do anything except reboot the computer manually because the CMD+OPT + Escape are not accessible. Turn off your Mac. Turn it on and hold Command-R until you hear the startup chime or see the Apple logo. Click Disk Utility when the macOS Utilities window shows up. Click the disk that's running Big Sur.

Apple logo

Learn what to do if your Mac starts up to an Apple logo or progress bar.

Globe with alert symbol

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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.

Sierra

Lock icon

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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.

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Login window

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

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 more

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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.