Fairly often, LCD monitors/tvs, etc have a couple dead pixels, as a result of the manufacturing process. According to Dell, the industry standard is that you need to have at least 5 dead pixels for the display to be considered defective. Depending on where the 4 dead pixels you are likely to have are, this can be very annoying.
To find out if you have any dead pixels, the best thing to do is to take a good look at your display with a white background (empty PowerPoint slide in slide show mode?). Look for small off color dots (often red). If you have dead pixels that are black, they are probably not fixable, but if you have colored ones Ehow has an article on how to bring them back to life (I haven't tried it). They also have a video file which changes colors 30 times/second which, claims to help eliminate damaged pixels. Its worth a look for those with slightly defective lcds (I'm sticking with my crt).
If you are getting a new device with a color lcd, you should look for dead pixels, to see if you have enough to send it back and try for a perfect display. I have read that CCD image sensors also sometimes show a similar effect, so watch your new digital camera closely as well.
Enjoy your evening.
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Dell is not known for standing by its products offering 90 warranties up against 3 year warranties from HP, often. Check the top LCD maker, Samsung, who makes the greatest number of screens by volume and some of the highest quality on the market. They have long offered ZERO DEAD PIXEL warranties. Consumer vs. Commercial grade once again.
http://hardware.slashdot.org/article.pl?sid=05/01/01/1440201&tid=196&tid=152&tid=1
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