Set up 4 new Dell PCs with TFTs today, one had a dead pixle so don't feel too hard done by. Informed my boss of this fact and she wasn't too happy. Had to explaina bout the ISO standards.
Unfortunatly there isn't a lot you can do unless there are, as Sony say, 5 or more. In some cases you'll get it replaced because its somehwere really obvious but thats unlikely. This is the risk with buying a TFT screen.