I had this problem on my Ferrari 4005. It took about 2 days to dissapear, but i was using the computer during that time.
BTW, WarcraftIII can cause this to happen over a period of about 30 minutes if you leave it paused.
I left my F4005 in the menu while playing warcraft III last night (F10 key) for about 45 minutes.
I noticed that I had what seemed like screen burn on the LCD so I shut down the laptop overnight thinking that it would...