Startup screens can vary by Mac model, operating system (macOS), and more. Some screens, such as the question mark or prohibitory symbol , mean that you need to resolve an issue before your Mac can finish starting up.
For all Mac models, startup is complete when you see the Finder menu bar, desktop, and Dock.
Blank (empty) screen
It's normal for a blank screen to appear once or more during startup. Its background can be black, gray, blue, or a desktop picture. If an image doesn't appear after a few moments, make sure that your display is turned on, connected, and has its brightness turned up.
Apple logo or spinning globe
Your Mac displays an Apple logo when it finds a local startup disk, which is a startup disk built into or connected to your Mac. If it can't find one, it may look for one on your network. When using a network startup disk, your Mac displays a spinning globe instead of an Apple logo. A spinning globe also appears when starting up from macOS Recovery over the Internet. As startup continues, you should see a progress bar or , which might alternate with a blank screen several times.
System lock PIN code
Your Mac asks for a PIN code when it has been remotely locked using the Lost Mode feature of Find My Mac. Enter the four-digit or six-digit passcode to continue.
Thunderbolt, USB, or FireWire symbol
A large Thunderbolt , USB , or FireWire symbol onscreen means that your Mac is in target disk mode.
- Learn what to do if your Mac doesn't turn on or finish starting up.
- Learn about Mac startup sounds and POST RAM error codes.
- When starting up from Windows using Boot Camp, your Mac doesn't display an Apple logo or the other screens in this article.