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it's locked and it shows the screen for a 4 digit code and under it says stolen mac report to police or call
Cyber16 wrote: Disconnect the battery from the logic board, press & hold the mac power button for 15-30 seconds. You could even try this step once prior to a re-flash of the efi chip then see if it cleared,
Remove the hard drive before you power it on any further, delete any partitions that may be on it again
re-build that Mac OS usb drive, then write protect it prior to using it
"When you see a circle with a slash symbol instead of the Apple logo, it means your Mac couldn't find a valid System Folder to start up from."
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