I have a late 2010 MBA 11", and I've been running into an issue where the backlight won't turn on when I open the lid. I can see (barely) that the screen is on, but I can't get the backlight to turn on. I have to close the lid (sometimes a few times), and eventually it'll come on. I'm running Mountain Lion (latest version), and it's always plugged in when this happens. Just curious if anyone else has run into this. It's an intermittent problem.