Avrdude: ser_open(): can't open device "\\.\COM7": The system cannot find the file specified.Problem uploading to board

Projects General Guidance
2
  1. Which board?
  2. Did you select the correct port? Does it disappear from the IDE and Windows Device Manager when you disconnect the board.
  3. What does Windows device manager think of your board (with everything connected)?
  4. Can you upload blink with your setup?
  5. Can you upload blink with everything disconnected except USB.
  6. Does your code upload when you disconnect everything from the board except the USB?
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