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步骤行

[title] PRAM/NVRAM Reset
[* black] Shut down the computer
[* black] Press the Power button
[* black] Before the grey color screen is shown, press and hold Command + Option + P + R keys simultaneously.
[* black] Hold down these keys until the MacBook restarts and then you will hear the startup sound.
[* black] Release the keys. Once you have reset PRAM/NVRAM, keep in mind that settings like disk caches, volume, time, keyboard and mouse preferences, will also be reset.

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