開機時按 cmd + option + p + r 清 PRAM 看看∼再不行的話,刪掉下面這兩個檔重開機看看∼Macintosh HD/Library/Preferences/Audio/com.apple.audio.DeviceSettings.plistMacintosh HD/Library/Preferences/Audio/com.apple.audio.SystemSettings.plist
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