I just got a new iMac Late 2012 27 inch and testing the hardware for any possible issues. So far, looks impressive. No fan noise (haven't ran any heavy duty stuff yet) or any other issues. One thing I wanted confirm is to check the backlighting and how good or bad it is. Can somebody explain a newbie on how to check for backlight bleeding?. I have time thru tomorrow when the 14 day return/replacement ends. I also read other threads that talk about this issue and also saw the images posted but couldn't figure out how to check it myself. I do have a iPhone 4S for taking pictures of the LCD. Please help.