Brought my wife a acer laptop from pc world at xmas, was fine untill the mouse pad on it starting over heating took it back, cut a long story short got our money back. She then got a (philips freevents x59p), had it 3 months, the mouse pad is sliver but now has a big white patch on it about the size of a finger print?? Should i take it back or does this happen to laptops?