Learn what to do if your Mac starts up to a circle with a line through it (prohibitory symbol).

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

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

Learn what to do if your Mac starts up to a blank screen, such as an empty gray, black, or blue screen.

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

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.

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.

A large Thunderbolt , USB , or FireWire  symbol against a dark background means that your Mac is in target disk mode.