Code not working on LPC2148 board

I bought an ARM LPC2148 Development board and started uploading code in it.  I wrote the code to blink the on-board 4 LEDs.  It gets uploaded successfully in the board but the LEDs never blink (leave alone the blinking according to the code).  I have rechecked the code again and again.  I am getting 0 V on the pins(P1.16, P1.17, P1.18, P1.19) to which the LEDs are connected.  I cannot figure out why this is happening.  Help!!

The code is:-

#include  <lpc214x.h> //Includes LPC2148 register definitions
#define LED1_ON() IO1SET=(1<<16) //Macro Functions to turn ON LED

#define LED2_ON() IO1SET=(1<<17)

#define LED3_ON() IO1SET=(1<<18)

#define LED4_ON() IO1SET=(1<<19)

#define LED1_OFF() IO1CLR=(1<<16) //Macro Functions to turn OFF LED

#define LED2_OFF() IO1CLR=(1<<17)

#define LED3_OFF() IO1CLR=(1<<18)

#define LED4_OFF() IO1CLR=(1<<19)

void  Delay(unsigned char j)    //This Function is used to cause delay between LED ON and OFF events

{

unsigned int  i;

for(;j>0;j--)

{

  for(i=0; i<60000; i++);

}

}

int  main(void)

{

PINSEL0 = 0x00000000; // Enable GPIO on all pins

PINSEL1 = 0x00000000;

PINSEL2 = 0x00000000;

IO1DIR = (1<<19) | (1<<18) | (1<<17) | (1<<16); // Set P1.16, P1.17, P1.18, P1.19 as Output
while(1)

{

  LED1_ON();

  Delay(25);

  LED1_OFF();

  LED2_ON();

  Delay(25);

  LED2_OFF();

  LED3_ON();

  Delay(25);

  LED3_OFF();

  LED4_ON();

  Delay(25);

  LED4_OFF();

}

return(0);

}