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Dead pixels
Ah, the most hated of problems with notebook screens. A desktop CRT screen will never have these, but because notebook screens are comprised largely of tiny dots that light up depending on what's displayed, there's a small chance that your notebook's screen will have some dead pixels.
This is one of those things that really hoses the consumer lately, because when you buy a notebook you pretty much expect it to work 100%, and if there are dead pixels on the screen, that isn't 100%, and many companies will only accept returns or replace the screen after a certain number of dead pixels are reached on the screen.
Two suggestions:
First, most major retailers can be pretty understanding when it comes to dead pixels. I know Best Buy will usually accept an exchange on a notebook with dead pixels.
Second, many users advocate the use of a program called Dead Pixel Buddy to find dead pixels on your screen. I do not, and I will tell you why -- If the dead pixel isn't immediately apparent on a personal examination of the screen or after casual use of it, chances are you aren't going to notice it. If you're anything like me, and you run Dead Pixel Buddy, and you find a dead pixel (or more), it's going to tick you off where you wouldn't have been ticked before. I don't see any dead pixels on my screen in casual use, but I'm not going to go looking for them, either.
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