Hey all, I got my first GN on 20/12/11 and had to send it back for replacement as it kept on freezing and turning off occasionally by itself. Yesterday I received my Brand New replacement.. I was very happy to get a new replacement as I had to wait for a few days and being without a phone is a nightmare This one does not reboot or freeze "well so far" however there is this "faded dirty mark" type of thing the size of approx 2 cm's on the top right corener of my screen.. This is very faint and can really only be seen on white backgrounds "ie when you open the web browser" also noticable on light grey backgrounds.. I am really heart broken about this as I just want a phone that is all good to go.. I am not thinking of sending this one back and getting a replacement.. Has anyone experienced anything like this? Will the mark go away in time? This is a mark internally and not external on the screen.. Its a very faded mark almost like a stain or birth mark .. Please advise. many thanks..