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Author Topic: (com port 3 already in use) displayed after upload  (Read 5262 times)
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Usb powers up arduino uno but cannot upload.
"com port 3 already in use" is displayed when i try to upload.
     Im having this problem on my new laptop, everything works fine on my desktop.
            Desktop running XP
            Laptop running WIN 7
Any help would be great, thanks.
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On the previous four laptops I've owned, COM3 is the internal modem.  Are you certain the Arduino is COM3?

Are there any Bluetooth / PDA / mobile phone applications running?
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shut down all programs and verified arduino is com 3.
  but no change
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Try this...
  • Unplug the Arduino
  • Start the IDE
  • Load a Sketch
  • Verify the Sketch
  • Connect the Arduino
  • The moment you hear the device insertion tone, click Upload
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I reinstalled everything and went through all the steps.
   everything works fine now. Dont know but i think i might have forgot
to choose the uno board in the tools menu.
   Thank you for your suggestions and help, I appreciate it.
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