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Boot
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Boot options
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Press and hold during startup

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Key combination  Description
---------------- ------------
cmd + v          Verbose
cmd + r          Recovery mode
cmd + s          Single user mode
C                Boot from Cd / DVD
D                Hardware Test
N                Boot from network
option           Select boot medium
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Startup Security
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To boot from an unsigned usb stick

1. Boot into recovery mode
2. Use the startup security utility from the utilities menu
3. Allow boot from external media
4. Disable secure boot signature check