I just bought my second iMac. My first is five years old and I love it. I didn't really want a new machine, but too many things were not available for my old operating system and Safari was not compatible with many sites. I sell my photography, so colors are important to me. The new monitors have gradient color -- light at the bottom of the screen and dark at the top. If I move the same photo around the screen, it will look different depending on where I put it. I thought the problem was unique to my computer and Apple gave me a new one, but the problem exists with the second machine. I'm not happy. Am I the only one with this problem? I thought about upgrading to the 24" as the Apple guy said it might solve my problem with the advanced monitor, but the 24" is too heavy for me. I won't go into all the explanation about why that's important -- it just is. My frustration level is quite high. Tonight I set-up the replacement computer and worked for about 90 minutes when the computer crashed. Yes, I know, I should have "saved" at some point, but my old computer NEVER crashed. I've tried calibration, but that didn't help. Does anyone have advice on how I might fix this? I am in no way a techie, so plain English would be appreciated. Thanks.