I work with the uno3 for some time, had no problems so far.
I tried to set up a servo motor with the knop example from this site, at first it worked great.
after a minute of playing with it, everything stoped working and now I cant see the arduino in the opening tab, just COM3.
when I'm connecting the arduino to my computer the board lights up, and the 5v output works.
but the there is no sound from the computer telling me something has been connected and there is no smell of something that burned...