回答“MacBook backlight dies at certain screen positions, almost unusable”The major problem with the mac book proof is the monitor cord which lead to the screen. I have develop this same issue of the backscreen going off. The first thing to do is to pull the computer screen, once u get into it u must ensure that all the screws that lead to the monitor is tighten, the solver for this problem is to gentle pull the power cord that lead to the monitor in order to release the tension on it. The power cord is next to the left hinge so when you flip open your laptop too much pressure is on it so the monitor light will go off I have done this to mine and two more friends as well and neither of us never ever see the problem occurring again. Also please please be careful how u open the screen it can be of real hassle.