How to test LCD display

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http://forums.fedoraforum.org – Hi folks, Just purchased a new Samsung 24" display, model 2494HM. I need to test it for dead pixels. Because the shop didn't test it, saying that if there are more than 3 dead pixels, Samsung will replace a new LCD display within 7 days. Google "how to test LCD display" found following link; LCD dead pixel test - Dead Pixels Test http://www.gdargaud.net/Hack/DeadPixels.html#LCD But I have no idea how to proceed. Could you please help. TIA B.R. satimis (HowTos)