Arduino invisible or dead?

Hi

I was using my Arduino an hour ago and then I did a wrong manipulation. Wired the 5v into gnu on my bread board :~ . My laptop shut down at this time :~ again. And I had some fume coming from somewhere as well :~ it would locate it more from the bread board than the Arduino. Never mind the laptop restart without any problem I tested the usb port they work, my cable is still working as well and the Arduino board seems to work but is invisible on the IDE.

When plugged the green led is On, the 13 pin led as well, it blink when I reset the board, but still no serial in my IDE. Does anyone already had the same problem?

Here is my configuration if it can help:

MacBook Pro: Mountain Lion Arduino Uno Rev 3 And IDE 1.0.4

Thanks

Any idea? Any one?