High as LOW in Arduino Mega 2560

Hi friendz, I had an issue with my arduino programming,

My arduino was using its program HIGH as LOW & LOW as HIGH i.e HIGH= 0 volt & LOW = 5 volt

And i jus used a example code

int led = 13;

void setup() {                
   pinMode(led, OUTPUT);     

void loop() {
  digitalWrite(led, HIGH);

I don't understand what you mean. HIGH means high, LOW means low.

Are you saying that code does not turn on the onboard LED?