Hi, after having my backlight dimmed all the way down for about 7 hours (it is runnin folding@home while I am sleeping), the left half of the screen is a lot darker than the right. After about five minutes though, it seems to go back to normal. Should I be worried about this? Could this be the first sign of backlight failure? Thanks! BTW, I have an iBook 700mhz 16mb vram.