Macbook黑屏问题修复: 重置PMU

[yehlu]

http://www.douban.com/note/201600644/

苹果不太会有让人生气和倍感烦躁的问题，却总会有几次莫名其妙的故障，好象一个极具智慧和灵气但又有些调皮的伙伴总要找些机会戏弄你，比如今天Macbook一开机就黑屏，我试了几次他都不肯回复正常，以为又是屏幕的问题，翻翻各种秘笈，原来只要重置电源管理模块PMU。

macbook pro turns on but screen stays black — my solution
Saturday, June 5, 2010 - 1:26 pm
By Colin

The Apple Macbook Pro would turn on, but the screen would not. The screen would stay black. I could tell the computer was on because when I hit the “caps lock” key, the green light on the key would turn on and off.

I fixed this the following way (this is basically resetting the Power Management Unit — PMU):

I disconnected the computer from the power cord, and from all other cables.
I held down the power button for several seconds to turn off the computer.
I let it sit 5 minutes.

I restarted the laptop while holding down the Shift key

. This restarted the computer in Safe Mode, with the screen visible again.

After I logged in (in Safe Mode) to make sure everything was ok, I simply restarted the computer the normal way, and the screen behaved normally again.

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If that doesn’t work for you, you could try these steps, documented at apple.com:

Holding down Command, Option, P, and R to reset your PRAM and NVRAM
Resetting PowerBook and iBook Power Management Unit (PMU)