It is more common then you think and most manufactures have said that to them up to 3 dead pixels and it may have to do with their proximity in the screen are acceptable non-defective pieces...So if Dell steps up and offers it then take it until you get one without it....
Dead or stuck pixels suck! What really sucks is that the manufacturer's deem so many stuck pixels acceptable. I went through 5 Olympus digital cameras trying to find an acceptable camera without dead pixels on the LCD or (way more annoying) the CCD. I finally got a good one, but it started acting goofy (wouldn't read cards all of a sudden), so I sent it in right before the warranty was up. The techs couldn't fix it. They kept tightening the card contact, so it made it harder and harder to insert the card, but it still didn't fix it, so they replaced it. Guess what? My brand new replacement camera has the damn stuck pixels. I just gave up and I'm living with them now. I dread buying another digital camera though.
BTW.. My aunt just bought a new Dell laptop and the LCD is miserable. You can't see the pixels when the screen is lit up, but if you go to a black screen, it looks like a whole constallation of red and green stars. Rediculous! She's not fussy, so she probably won't return it, but I would.
Anyway. I would try exchanging it and see if you get a better one. If you accept this monitor, you are just telling the manufacturers that they can get away with this crap.
Sal