Broken Atmega328 ???

Hi,
I recently bough an arduino board (it seems to be an arduino one clone) and I was having issues running a LCD shield.
I found out that Digital Pin 5 seems somewhat broken.
I tryed to run a skatck that does

void setup() {                
  pinMode(5, OUTPUT); 
 }

void loop() {
  digitalWrite(5, HIGH);   // set the LED on
  digitalWrite(13, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // set the LED off
  delay(1000);              // wait for a second
}

but my tester doesn't mesure anything between GND and D5.
I even tryed to test between GND and Atmega pin11 but it was always 0v!

Could my atmega be broken?

Thanks
G.

Where is

digitalWrite(5,LOW);

?

I low only the led in order to check that the program is working.
I only HIGH pin5 so I could expect to find 5v, but i always get 0.

PS: This method works for all other digital pins (0...13)