I just received my new 3.06 iMac (2008 model, but it's new, not a referb.) and it has one dead pixel top right, in the menu bar.
I checked over the screen pretty thoroughly, didn't notice anything, ran software update and it appeared after the restart. Are any more likely to 'die'?
Is it worth trying for an exchange? Bearing in mind that I bought it from a reseller and they don't have many of these 2008 models left. How common are dead pixels on the iMac displays? I don't want to change it and get one with 3 in the centre of the screen. It doesn't really bother me, but after you shell out a pile of cash you don't want a dud on principle.