My Arduino has all of its LEDs on. The
L LEDs are all on and my computer can’t see it (it's an SMD edition).
It can have many reasons, but you can try the following:
First time use?
- Check if you need to install a special driver for CH340
- Try another USB port
- Change USB cable
- Restart Arduino IDE
- Restart computer
- Reinstall Arduino IDE
- Test using another Arduino
- Test using another computer/laptop
- Replace USB cable
- The Arduino is (partly) broken, nothing much to do here
Is it an "official" Arduino purchased from their website? If it isn't, chances are you need to install CH340 drivers for your computer before the Arduino will be recognized. Drivers can be found here Have you successfully used this device with your computer before?