No usb serial on Mac

Question

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.

• Anonymous Penguin: Related: arduino.stackexchange.com/questions/804/… Does that solve your issue? What board are you using?
• Stein: No is doesn't solve the problem. Besides that: I use an original Arduino Uno.
• Handoko: On Linux go to computer>var>lock and delete the serial port lock files

Answer 1

It seemed to be a hardware problem on the board. Thanks for the effort.

• Gerben: You could try re-flashing the firmware for the usb-to-serial chip (atmega8u2) on the uno board.

Answer 2

If I try to upload with no device connected, I get a dialog with the message "port is blocked" and a message in Eclipse's console window that the port is not found.

So I'm guessing you've got a sync problem. UNO should reset automatically when avrdude connects. Try manually resetting it just before you click to start the download. If that works, then the automatic reset has failed.

• Stein: If I try to upload with no device connected, I still get: "avrdude: stk500_recv(): programmer is not responding"