Arduino Uno R2 not recognized by Mac

Hello all,

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?

The L LED does what when you click the reset push-button?

The L LED blinks three times when I click the reset button, so I guess the Arduino itself is still working. Even the sketch that was loaded onto it works. It is just not recognized by the MacBook.

“Duemilanove” and “Uno” are mutually exclusive. Which is it?

Make sure to have the drivers COMPLETELY updated.

capacitor99: Make sure to have the drivers COMPLETELY updated.

There are no drivers for the Uno on the Mac.

Duemilanove requires an FTDI driver update for OSX available here > http://www.ftdichip.com/Drivers/VCP.htm Don't know if R2 does too but it cant hurt.

bradjohns: Don't know if R2 does too but it cant hurt.

No. The Uno does not have a FTDI so FTDI drivers, won't do anything. If the board says "Uno" but has a FTDI chip, it is a counterfeit Duemilanove disguised as a Uno.