Arduino Uno L - LED is blinking red


i'm a new Arduino user, if i want to start with the arduino and stick it to the PC (WIN7), the ON Led glow red and the L Led is blinking red all the Time.

Is my board defect or is this normal?

Thanks for your Help...


The boards come with a blink code preloaded on them. If you do:

  • File > New
  • Sketch > Upload

After the upload completes the blinking should stop because you've uploaded a blank program that does nothing. If the blinking continues after doing that let me know which version of the Arduino IDE you're using.