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Power on your Mac and launch Terminal.
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To launch Terminal, you can either use Spotlight Search or navigate to Applications / Utilities in Finder and double click the Terminal icon.
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Copy and paste the following command (or type it exactly) into Terminal:
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sudo nvram AutoBoot=%00
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Press [return].
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Your [return] key may also be labeled ⏎ or [enter].
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If you are prompted for an administrative password, type the password and press [return].
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Your password will not be displayed in Terminal.
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You can now safely power down your Mac and remove the bottom case, without it accidentally powering on.
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Remember, you must still disconnect the battery before servicing internal components.
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When your repair is complete and your Mac is successfully reassembled, you can re-enable the Auto Boot feature.
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Power on your Mac and launch Terminal.
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Copy and paste the following command (or type it exactly) into Terminal:
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sudo nvram AutoBoot=%03
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Press [return].
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If you are prompted for an administrative password, type the password and press [return].
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Your password will not be displayed in Terminal.
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Alternatively, you may reset your Mac's NVRAM to re-enable Auto Boot.
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