If one pixel is dead then surely its a faulty product and the whole unit should be exchanged/repaired, so long as the product in general is still covered under the manufacturer`s guarantee. Their rule may be three pixels, but I`m sure you could get it changed with one dead pixel if you made enough noise. If a company sells you a new tv-screen (which is partly what the PSP is) with dead patches on it out of the box, they don`t have any argument not to fix/replace it for you. You might have to get very determined, but you`ll win in the end because you`re right. Hopefully they`ll fix the pixel problem before it becomes a problem anyway.