Hi! I was going to buy the 21'5 iMac in June or July. But I have read some forums and I am really scared now about some things : -Dead Pixels -Dust inside screen -Yellow tint -Flickering And what about problems with SuperDrive? I have read about problems about them. I really want the iMac. But I have been with PC since I started with computers. If I get a DVD drive, I replace it. If screens fails, you can replace it... What about iMacs?