Our shop just purchased/installed 3 new 27" imacs running 10.6.4 (2.8 GHz Intel Core i5 / 4 GB) - our IT guy configured them for us with corporate licensed software. The problem is that two of the three macs have the colors blown out. Example, when viewing a customer supplied file that we are going to print, that has swirls of color, varying from 5, 10, 20, & 50% screens of black, on two of the macs all the screen 10% and less do not show up. On the third mac the same file views just fine. It is not the screen brightness setting and it appears that the monitor calibration is set up the same on all macs. any suggestions would be greatly appreciated.