2011年的mac min 開機一陣子之後大約5分鐘會螢幕自動暗掉？
我看轉速正常 溫度大約55-65度
也按了option command + p+r 清理了
可是就是有時候關機之後開不起來
系統是sierra
請問各位mac高手，這大概是什麼問題？
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試試看 拔除所有 usb 連接 在做重置
macOS Sierra Boots to Black Screen, Stuck on Black Scree
Some users have discovered that macOS Sierra will boot to a black screen and get stuck, unable to go further. This gives the appearance that the Mac is off, but it’s actually on and the screen is just stuck dark, with the Mac doing who knows what. This can happen right after the initial installation, but also during a standard Mac system restart after having updated to Sierra. I personally experienced this in the latter scenario during a regular reboot, and as you can imagine it’s fairly annoying to discover the Mac won’t boot up normally. Fortunately with prior experience handling a similar issue, I was able to resolve it with the following steps in this order:
Disconnect all USB cables and USB devices from the Mac, aside from a mouse or keyboard if applicable
Shutdown the Mac
Reset SMC
Reset NVRAM/PRAM
Boot as usual
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