My MacBook Air doesn't plug in the black screen, but what's the problem?
The screen power saving scheme is different when plugged in. The later do not plug boot can normally open screen, will not plug the brightness to open at least 1 or more.
The power option should be a problem. Landlord preferences into the system settings = Energy Saver - battery, set up.
First power plug, after the screen lit up and then unplug the power, if the screen off, then click a F2 to increase the brightness of the screen lights up, then you will find that the brightness of 1 lattice, shows the initial state for the 0 grid, which is why the use of the battery when the screen is not bright.
