My brand new MBP display is moderately dim, and the brightest colors are visibly flickering. The flicker is slight, but definitely noticeable. Unplugging the power cord dims the screen even more and stops the flicker. The unplugged computer remains dimmer than when plugged in, even if brightness is set to maximum. I held the computer's light sensor under three 75W bulbs, it didn't get any brighter. Ideas?