I've just been up to my local electronics store to buy the new base 21.5" iMac. I noticed the display model had a dead pixel in the centre of the screen so I asked once I had paid for it if I could open it and check the iMac before leaving, the store said that was fine. I opened it up and it had 3 dead pixels! So they swapped it over for another and that had another 2! (It's either dead pixels, or dirt behind the glass, either is unaccepted in my eyes). So I just got a refund as they said they wouldn't open anymore. So my question is has anyone else had any problems? I'm really worried about buying one now as I've had such bad experience. I'm totally unsure in what to do, I might even just keep my current iMac.