So today, I buy a brand new top-of-the-range iMac setting me back a hell of a lot of money. I get it home, set it up, everything is going fine. Then I notice on the back there is a scuff about 2cm across, you can see it clearly when it's against the light. I've taken a picture and it's clearly visible Do you think I should take it back? and would Apple replace it? I've not even had it 24 hours. to say I'm a bit gutted is an understatement.