No access to ports

Hello, I plugged an arduino UNO on my computer (windows 10) for the first time, 2 leds are switched on. I would like to use it but I have no access to the different ports. Someone told me to check my drivers but I have no unknown peripheral device on my computer, like if nothing was detected.

Can someone help me ?

Make sure the USB cable is fully inserted into the USB jack on the Uno and your computer. Especially with a new Arduino board, you might have to use a bit more pressure than normal to get the connector all the way in. An incompletely inserted USB connector can provide a power connection (and thus light the LEDs on the board), but not provide a data connection (and thus no port).

Try a different USB cable. You might have a damaged, defective, or charge-only cable that doesn't connect the data lines.

Please READ THIS POST to help you get the best out of the forum.


These steps may also save you some unnecessary time and effort in the forum.


  • Check you have a COMMON GROUND where required.

  • Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.

  • Try other computers where possible.

  • Try other USB leads where possible.

  • You may not have the correct driver installed. CH340/341 or CP2102

  • There may be a problem with the board check your wiring first.

  • Remove any items connected to pins 0 and 1.

  • Ensure you turn off any additional security / antivirus just to test.

  • There may be a problem with the PC try RESTARTING it.

  • You may be selecting the wrong COM port.

  • Avoid cloud/network based installations where possible OR ensure your Network/Cloud software is RUNNING.

  • Clear your browsers CACHE.

  • Close the IDE before using any other serial programs.

  • Preferably install IDE’s as ADMINISTRATOR or your OS equivalent
    Performing the above actions may help resolve your problem without further help.