mac os 必读

一定要用我已经做好的USB bootable Sierra to reinstall system.

先重置reset PRAM / RESET SMC

Reset PRAM:

COMMAND KEY + OPTION(ALT) + R + P

开机听到chime 就同时按下上面四个键,按住,直到系统重启再松开。

RESET SMC:

对台式机的mac就是把电源插头拔下来,过1分钟,按住电源开关键5秒钟即可松开,就此完成SMC RESET

Firmware update page:

https://support.apple.com/en-gb/HT201518#imac

 

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