Got a new high end 27" iMac, but sent it back due to dog whistle and buzz. Got another iMac and the brightness is on 100% and it's equal to 70% on my first iMac, I couldn't have it on 100% on the first iMac I got cause it would kill my eyes, and now I'm at 100% and I still want it to be brighter. I know there was a firmware release to the 21" iMac for a brighter screen. So is there gonna be a firmware for the 27" out soon to fix the problem, or isn't it a big problem? Asume it's not a hardware problem. And got the dog whistle and buzz on the 2nd iMac, and on top of that the crappy Seagate HDD, and a hair behind the glass and some dead pixels. I don't think I can get a good iMac within 10 tries. Guess I was wrong when going from PC to mac for quality reasons.