What does this error mean?
Type the alert, error code or describe the symbol you see. Osnivo shows what Apple says it means and what Apple says to do — word for word, with the source.
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Symbol
Flashing question mark at Mac startup
If your screen shows a flashing question mark, circle with a line through it, or anything else, your Mac is turned on but isn't starting up:
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Symbol
Circle with a line through it at Mac startup
If your screen shows a flashing question mark, circle with a line through it, or anything else, your Mac is turned on but isn't starting up:
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Symbol
Globe with a warning symbol at Mac startup
A globe with a warning symbol (exclamation point) means that your Mac tried to start up from macOS Recovery over the internet, but couldn't.
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Symbol
Lock icon at Mac startup
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.
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Symbol
Image of a mouse or keyboard at Mac startup
If you see a line drawing of the underside of a Magic Mouse or backside of a Magic Keyboard, with a small arrow next to the power switch in the drawing, your Mac can’t detect your built-in or external mouse, trackpad, or keyboard.
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Symbol
Thunderbolt, USB or FireWire symbol on a Mac
A large Thunderbolt, USB, or FireWire symbol against a dark background means that your Mac is in target disk mode.
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Symbol
Display icon with warning symbol on Studio Display
A large display icon with a warning symbol against a dark background on your Apple Studio Display means that your Studio Display is in recovery mode.
Every meaning and step is quoted from an Apple Support article; Osnivo writes only the titles. Errors often come with a step-by-step fix in Osnivo Fix.