Arduino Yun not detected on USB!

My Yún, with just one week, is stopped to be detected via USB.
I've tried 2 different cables, 2 different computers and O's (Linux and WinXP) and nothing =(
It's not detected but it power's on ok.
I can access it from wifi to it's control panel or by SSH.
I've done a full reset and didn't work.
In this site (https://www.sparkfun.com/products/11286) people are complaining about the Leonardo USB connection that is the same micro-usb.
Maybe the usb connector is gone.
Anyone with same problems?
Could it be possible the Linux blocking the usb connection?
Thanks for any help

http://forum.arduino.cc/index.php?topic=188101.msg1593444#msg1593444