Bought my laptop at the start of August last year. For four weeks out of six, I am on it every night for about twelve hours. The machine was set up to turn the screen off/standby after a few minutes in case I had to leave it (in the shack at work), just for safety. The internet is rare where I am working and I didnt want people just inviting themselves to use it. Anyway, over the past few days I have noticed that the left side/left corner especially is a little darker then the rest of the screen. Its about the brightness that the display goes if I disconnect AC power. Its starting to get noticeable. The computer is still under warranty so I am not worried about that. I was curious if how I was having the screen turn off actually shortened the life of the backlight. I am starting to think that it did. Would it be better for it if it was just on for those twelve straight hours?