Arduino Uno L led not blinking

Hi. I just got an Arduino Uno and I tested it with an LED light and it worked. Now when I connect it to my computer, it doesn't work. The L light not blinking. The ON light instantly turns off. My computer can't recognize it. What it's wrong?

What "LED light"?

Red LEDs
sorry if my English is bad :frowning:

You mean a red LED?

If so, did you use a current limiting resistor between the LED and the Arduino? Did you disconnect the LED again?

Can you make a drawing how you connected things? Take a photo of the drawing and drop it here in a reply (try to limit the size to something reasonable like 300kB).

It fixed somehow. Now everything works

Ah, you pushed the USB right into the board then. This has been a common error we see every month or so!