It's an ex-adapter. Don't see too many of them fail, though. Weird. I suppose the only thing I would check now is some other USB device that is powered from the USB port -- just to eliminate the possibility that the USB +5v hasn't gone away. Andy.
Hm, I wonder if I accidentally plugged it into one of the charging ports on my monitor. The Asus's I use have a dedicated charging port... I bet that could screw the MK USB up due to a higher amp output.
It's voltage that will burn something up -- not the ability to supply current. USB standards define the provision of 5 volts. Andy.