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Arduino Uno issues - can't connect.

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I'm having an issue with 1 (of many) Arduino Unos.
Below is a rundown of what happens with the Arduinos when they're working, and what happening to the one that is not working:

Working devices:
  • device is plugged to computer using USB.
  • Windows makes the chime of a device being connected and lights flash on the device.
  • Arduino IDE ads COM port to list (beyond default COM1) that includes Arduino in the name (Such as "COM 6 Arduino...") 
  • Code is sent to the Arduino and the code executes on the Arduino successfully, such as blinking pin 13 LED every second.
  • New code is sent to the Arduino and executes successfully.

Not working (same computer):
  • device is plugged to computer using USB.
  • Windows does NOT make the chime of a device being connected - lights DO flash on the device.
  • Arduino IDE does NOT add COM port to list. Attempting to use listed ports is unsuccessful.
  • Arduino is executing previously loaded code: blinking pin 13 LED every second.

Any pointers on what's wrong an how to fix this??
asked August, 30, 2021
milliganimals

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