Arduino UNO with on LED in red instead green

Hello everybody,

I connected my ARDUINO ONE to an external power supply but I made a mistake and this power supply was 230VAC / 12VAC so something was wrong. Thereafter, the LED on is red instead of green. I changed the diode but it's still the same. Can someone help me?

Thanks in advance


The wrong voltage won't change the color of the LED. Some boards just have a red LED instead of green. The color of the LED has no meaning.