What it means — Apple
A large Thunderbolt, USB, or FireWire symbol against a dark background means that your Mac is in target disk mode.
Read the full article for pictures and model-specific details: If your Mac doesn't start up all the way ↗
A large Thunderbolt, USB, or FireWire symbol against a dark background means that your Mac is in target disk mode.
Read the full article for pictures and model-specific details: If your Mac doesn't start up all the way ↗