So I had this blury looking dead pixel on my laptop LCD and I tried the “massage” technique without any success.  I thought it was weird because it was blury, and usually dead pixels are very sharp and exactly one pixel.  Anyways, I decided to try slapping my screen from behind and boom, the “dead pixel” moved down about an 1/16th of an inch.  Well, I kept tapping the back of the screen until the spot went out of site.  I guess some dust got behind the screen or between the LCD and the back light causing the dark spot.  Weird, huh?