USB provides power only

For some reason, the Mini-USB port (on the BeagleBone Black) is providing only, no USB device is being detected. The rest of the board seems to be working, the leds are blinking right I can access via the RJ-45 port (http & ssh).
I have

  • provided extra power via barrel.
  • tried at multiple computers and under different OS-s.
  • tried different USB cables.

I currently don’t have any 4GB microSD cards to try a software update, don’t know what else to try now. Any ideas what’s going on?
This is a brand new device, arrived few days ago, hence the Mini-USB port has never fully worked for me.

Request and RMA.