解决「停止拓展」后屏幕无法显示
很多同学升级完发现菜单栏这个紫色图标后第一反应是停止拓展，然后：
- 内置屏幕的 Mac 设备在「屏幕镜像」中点击「停止拓展」后会导致这块外接屏幕不再显示，需要删除下面的配置文件并重启才能再次使用这块屏幕：
/Library/Preferences/com.apple.windowserver.displays.plist
- Mac mini 这种无内置屏幕的设备则「停止拓展」按钮不生效，「屏幕镜像」的紫色图标一直显示在菜单栏。（极少的情况下「停止拓展」能生效，这时只能通过「屏幕共享」或 VNC 来访问了……
原创文章，作者：李晋，如若转载，请注明出处：https://www.lijin.cc/blogs/809.html
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