This evening I could not connect my Arduino Uno to my MacBook anymore, but it still worked this afternoon. I have not done anything special with the device, but it does not show up in the tools > Serial Port menu nor does it show up in /dev at all. Only the Bluetooth modems are visible. I also already tried two USB cables, but it does not show up with either of those. I also tried another MacBook, but it was also not visible there. The computer does see my Funduino Duemilanove
The model is an Arduino Uno R2.
Is the board just broken? Or can this problem be fixed?