I have a 27" iMac purchased last January. Every time the computer wakes up, the display activates with normal coloring but after a second "shifts" into a different color profile with a blue'ish tint. All software updates have been applied. I've reformatted the computer twice since the initial purchase. Problem persists. I'm well aware of the yellow tinge problem with 27' iMacs, but based on my research of past posts the blue color shift has only been a problem with Macbooks. Has anyone else experienced this problem? Any ideas or tips on resolving? I'm stumped.