Well that'll learn me to leave my 1 1/2 year old in the study for 1 minute. He's pressed some buttons on my iMac and now everything looks like a photographic negative. I've had the iMac for just over a week and am still finding my way around. I see how I can change backgrounds and desktop settings but can't seem to find the key to getting the original look back and my eyes are going blurry looking at the screen!! Anyone point me in the right direction, it must be simple enought if my son can do it!!