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When I connected an external power supply to my Arduino Uno R3 (it was connected to PC via USB cable too), I heard Windows disconnected device sound and the device isn't visible since then (nothing happens when I plugin the USB). Cable is ok, because it works with the second Arduino. TX/RX LEDs don't blink anymore.

Following this guide, I checked two things:

  • I was able to flash ATMEGA328 with LED blinking program using external ICSP programmer and it worked
  • I was able to flash ATMEGA16U2 with the official firmware and it completed without any error

Is there anything else I can check? I'm not really desperate to fix it - I just want to know which component is broken.

michalo2882
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1 Answers1

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Is it possible you connected the 12V to the 5 volt pin. This would probably blow the port on windows and destroy the arduino but it appears you got lucky with the arduino. Try something else not related to the Arduino stuff after powering down and restarting the windows computer. If that does not work the odds are high the Windows port is blown. If it now is working try again you may be all set.

Gil
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