Macbookpro the emergency boot under black screen

Habit:

Do not shut down the direct cover, this kind of operation is very frequent, accumulated to a point in time to open the machine.

Symptoms:

Black screen, Logo light is bright, so the black screen also has a backlight, caps lock can not be used, the logo after the lid is still bright this is more strange;

Shut down again or the same as above.

Prescription:

Forum http://bbs.feng.com/read-htm-tid-9814197.html #7楼

I am recovering the PRAM base preference, which is valid after use.

Turn off the machine = find good option command R p Four keys = Press the power button immediately let go, press and hold the four keys = Keep holding down and so on to hear four tones power on after the sound.

The Select User login is displayed.

The following way has not been tried, which day the first way does not work, you can try again:

Smc
Restore Power Configuration Manager
1. Connect the power cord to the device after shutdown
2. Press and hold the shift control option at the bottom left of the device and the power key 15 seconds or so.

Online Related: http://www.anxia.com/mac/85118.html

Link:http://www.cnblogs.com/farwish/p/6883808.html

@ Black eyed poet <www.farwish.com>

Macbookpro the emergency boot under black screen