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My computer cannot detect my Arduino Uno anymore,

  • Reset button- > L led light blinks and it turns on forever
  • Arduino 1.6.5: Tools->Port (greyed out) I remembered that previously it wasn't like this
  • Unable to upload any sketch codes into the Uno anymore
  • The existing code uploaded onto the Uno is FastLED(FirstLight) and it will work on my LEDs when I plugged them in

I have tried to .... but none fix my issue

  • Restart my computer
  • Press the reset button on the Uno
  • Using the device mananger to change COM ports
  • Device manager -> Other devices -> (nothing about Arduino Uno is found here)
  • Plugged Uno into another computer but still doesn't work
  • Reinstalled IDE

Problem shown in sketch,

avrdude: ser_open(): can't open device "\.\COM3": The system cannot find the file specified.

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

Community
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Zainau
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  • Try to install the ardunio driver again. Connect your arduino to another pc & see if it is working or not.? or maybe try connecting any other serial device to your pc and check if it shows any com ports or not.? – Aircraft Sep 08 '15 at 04:40
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    I'm voting to close this question as off-topic because it has been abandoned for two years without any followup that could make it answerable ever being provided, and it has started to attract low quality responses. – Chris Stratton Aug 17 '17 at 21:54

2 Answers2

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I have experienced a similar issue after plugging in another Arduino device. I didn't set up my environment for a long time and thus forgot he iterates the COM-Index. Maybe this is too easy, but you didn't provide much information.

This solved my problem: Open Arduino application > Tools > Port > Change to the target Port

If you are unsure which port to choose from: (on Windows) Open Device Manager > Connections (COM & LPT) > Usb Serial Port (COM[x]) where "[x]" is the index you are looking for.

ConfusedHorse
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  • This is dangerously close to an "I'm having this problem too" response. Changing the port seems unlikely to be a solution, since having the port menu greyed out suggests there are no valid choices there to choose. The problem here would appear to be far more fundamental - an electrical fault, bad cable, or bad driver. – Chris Stratton Aug 17 '17 at 21:52
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Try a different arduino w/ your first computer, see if that will work.

Owen
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