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I had an early flat screen that did this, and by turning down the backlight it makes it much less noticeable but didn’t make it go away. Short of disassembly of the monitor and adding something like a thin foam strip or electrical tape to block the light, I don’t think there is anything you can do to really fix it. That said, I did read a post on a forum from a guy who claimed to have had success using a method where he gently massaged/tapped the screen going from the “normal” area in to where the bleed was noticeable. Here is a link to the post if you want to give it a try. As long as you are careful, I don’t see what harm it could cause, even if it doesn’t work.