Hi everyone, I've just changed my old white iMac 24" (screen spoilt) with a new 2011 iMac 27" and I'm wondering if the black levels I'm seeing are currently par for the course for LCD displays? In a dark room (no lights) and no external light sources my screen (at my brightness level of ard 1/5th of the slider) the screen appears slightly greyish all around. With a little bit more light leakage on the bottom right. A replacement is an option but I don't want to do one if they are all generally of the same level as this screen. I don't think its also possible to get a 'perfect' LCD at this point of time. Have attached some pics showing the grey effect at 1/5th brightness, zero brightness and max brightness for comparison. I've tried to match the photo settings closest to what it looks like with the naked eye so none of the levels were exaggerated. I have to note that even when the brightness is set to zero, the screen still looks greyish. Appreciate the help if any!