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On my iMac 15.1 from 2012 with Big Sur I wanted to startup from another USB-disk. The normal procedure with the Option key did not work so I tried using a Target Disk. That looks like trouble.
After reboot the screen is just black with a lock and an input field. Connecting to my recent Ventura laptop via cable does not help.
With a wired keyboard and wired mouse I can typ some text in the input field, but there is no reaction.
How can I leave the Target Disk mode?
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