No usb serial on Mac I've been using my Arduino UNO without a hith for a few days now, but suddenly I can't program it anymore.

When I try to programm my Arduino on Mac, I get the following Error:

avrdude: stk500_recv(): programmer is not responding


The USB option under serial port has disappeard (It was there before). Has anyone an idea on how to fix this?

The last thing I did is use the serial port for some communication. A reboot hasn't improved anything.

I tried programming Linux, but it resulted in the exact same result.
It seemed to be a hardware problem on the board. Thanks for the effort.