Arduino UNO port unavailable

I just got an UNO and I tried uploading a program, but I get an error saying "error uploading check if the selected board is currently available". I'm connecting the board to my HP laptop with windows 10 and I'm using Arduino online editor.

Arduino/Genuino UNO is selected but a red x is shown and when click in the Monitor menu in the online editor "Serial Port unavailable" is shown. The plugin is installed and open (green icon).

When I connect the board to usb on my pc a green led turns on in the board and sometimes an orange led (pin 13) is also on. Leds are on all the time, no blinking.
Same hapends when the board is connected to 6Volts dc adapter via power adapter.

I try reseting but nothing happend.

Device manager don't show any device when I plug in the board but the usb port works fine with a memory stick or mouse so It must be fine.

I changed usb cable but same thing hapends.

I think my board is broken.

Any advice to know what is wrong and how to fix it ?

Thanks in advance for your help.


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.



It is a original UNO R3. Driver is installed and working ok (Plug in icon is green and white).
I clear chrome cache and restart my pc.
USB is version 3. I also install Arduino IDE on my pc and the port option on tools menu is gray and I canot select it.


So this is for the CREATE ONLINE EDITOR ?