lcd 20*4 ...help me please

i have lcd 20*4 and it did'n work ..
i try to test it without the full circuit but it did'n work
i connect the Vss to o v , and Vdd to 5 v and it's not work
and i asking to the why of test it

please post the circuit, related codings as well as the simulation file, if you are doing one

the lcd full file located in th post ( help me for lcd project )
and if you did'n find it .. i will send it to you

Nope. its not there

well ... i will send it to you

---------- Post added at 16:06 ---------- Previous post was at 15:38 ----------

/*************************************/
/* Project: Frequency Counter */

/*************************************/

#include <16f877a.h>
#use delay(clock=20M)
#include <lcd420.c>
#include <LCD_D.h>
#fuses hs,nowdt,nocpd,nolvp,noprotect

#byte portc=0x07
#bit led=portc.4

void LCD_D();

unsigned int16 value;

void main()
{
set_tris_c(0x00);
led=1;
delay_ms(500);
LCD_D();
delay_ms(50);

while(1)
{
set_timer1(0);
setup_timer_1(t1_external | T1_DIV_BY_1);

delay_ms(1000); // in protues, should be 1000/3

setup_timer_1(T1_DISABLED);
value=get_timer1();
lcd_gotoxy(11,2);
printf(lcd_putc,"%LU HZ ",value);
led=!led;
}
}

void LCD_D()
{
lcd_init();
delay_ms(50);
printf(lcd_putc,"*Frequency Counter*");
lcd_gotoxy(1,2);
lcd_putc("Frequency=");