Some users have reported an issue in which, after the update to Mac OS X 10.6.3, MacBook screens fail to power on the LCD backlight. This results in a faint, dim, barely visible image on the screen.
Sleep corner. James Wang notes a workaround that allows recovery from the backlight failure, as follows:
- Set up an active screen corner (Leopard: System Preferences, Expose and Spaces) as Sleep Display.
- Remember which corner you set the Sleep Display as (preferably one out of the way so it doesn’t disturb your work normally—bottom right works well).
- When the problem occurs, move your mouse to the screen corner.
Downgrade to Mac OS X 10.6.2. In extreme cases of this issue, a downgrade to Mac OS X 10.6.2 may be the only viable option.