Exclamation [Q] xperia s USB port dead !! please help

my xperia s usb port is dead my pc refuses to detect..i have the same problem as mention in this thread http://forum.xda-developers.com/show....php?t=2125117 tried every solution as mention in that thread but still my usb port aint working i even got my usb port replaced but still the problem persists.tried different usb cables different pc