So I have exactly this: Apparently called the stage light effect and like most it has occurred conveniently a few months after my warranty expired. Google tells me the fault is likely the "LVDS" (‘graphic cable’) being faulty or poorly connected. Less likely is an actual LCD issue. However, Apple apparently generally tells you to cough up for an entirely new LCD despite the fix often being as simple as replacing the cable or reconnecting it properly. Any ideas on what is the best course of action?