Is my Arduino board defect? No matter what program I upload the pin 13 turns on and off 3 times and that's it

Question

Just trying to find out if my Arduino UNO R1 board is broken or not.

First of all, everything seems normal, Arduino board shows "on" (green) when I plug it on my computer, I also can verify and upload programs to my Arduino board. But, no matter what program I upload the pin 13 turns on and off 3 times and that's it. I'm checkin it by using a LED. Eg. if I want to use another pin (ex. 7, 8, 12) it doesn't work, or even to write a program for turning on/off 9 times pin 13 doesn't work...

Note: I noticed that pin 8 turns the LED for less than a 1/2 a second.

I already tried to restart board by bridging the reset pin and also by pushing reset directly on the board, I also reinstalled Arduino Genuino Application. I thought to update Atmega8U2 firmware but accordingly to Arduino site I don't need to update since I have firmware rev. 0.01.

It would be also great not to have to buy a new Arduino UNO. Thanks for your help

Edit: Here is how I'm trying to make pin 12 work

int ledPin = 12;

void setup()
{
    pinMode(ledPin, OUTPUT);
}

void loop()
{
    digitalWrite(ledPin, HIGH);
    delay(2000);
    digitalWrite(ledPin, LOW);
    delay(2000);
}

Answer 1

The best way to check if Arduino is working or not is to install Firmata. Here's the necessary steps:

1) Download Firmata application from the official website.

2) Connect Arduino to the computer

3) Open the Arduino IDE and burn the example Standard Firmata [File - Examples - Firmata - Standard Firmata]

4) Open the application, leaving the Arduino connected.

5) Chose the right serial port and debug every pin =D