My phone (11 month old HTC Touch Diamond 2) has developed a rectangular patch in the centre of the screen that looks like oil floating on water, all swirling rainbowesque colours. Cutting a turgid saga short, Carphone Whorehouse says it's a Newton's Ring, caused by overpressure on the touch screen. They say it's not covered by warranty & I'm stuck with it or can pay for it to be repaired. I googled Newton's Ring & found them described as concentric phenomena, not rectangular. My questions are; Might my issue be something else? and as the phone still works, is the condition dangerous? any advice gratefully received.