Wow. I have a flickering LCD on my MacBook too... it happens most often when the display dims, but also happens at other times. I've had the laptop since October, and the flickering just started in April... less than six months and not used that much either... and this isn't the first problem I've had with it either. Anyway, I took it to the Apple store and repairs are still in progress. They've already had it for 14 days