PIC18F452 LED problem

[help]

Helllo,
I am a beginner for the PIC18F452 chip. I tried to test a simple circuit. I would like to light on LED on A1, A2 and A3. It doesn't work. When I pull out the 9V adaptor, LED (A1, A2 and A3) suddenly on then off. Could any expert help me? Thanks a lot!!
Hardware:
- Connect 1k ohms with LED on A1, A2 and A3 pin.
- Connect potentiometer with 5V pull-up on A0 and A5.
- Connect voltage regulator to supply Vdd 5V
- Connect oscillator on OSC1 and OSC2
- MCLR for reset

Software (with CCS code)
#include <18f452.h>
#include <stdlib.h>
#include <CTYPE.h>
#include <STDDEF.h>
#include <STDLIB.h>
#include <STRING.h>
#include <STDIO.h>
#include <LIMITS.h>
#include <SETJMP.h>
#use fast_io(A)

void main ()
{

output_high(PIN_A1);
output_low(PIN_A2);
output_high(PIN_A3);

}

[PCM programmer]

See this post for an example of a first program for the 18F452.
It blinks an LED on pin B0.
http://www.ccsinfo.com/forum/viewtopic.php?t=23106&start=4

[help]

Sorry, I repost the software...

#include <18f452.h>
#include <stdlib.h>
#include <CTYPE.h>
#include <STDDEF.h>
#include <STDLIB.h>
#include <STRING.h>
#include <STDIO.h>
#include <LIMITS.h>
#include <SETJMP.h>
#use fast_io(A)


void main ()
{
set_tris_a(0xF1);
output_high(PIN_A1);
output_low(PIN_A2);
output_high(PIN_A3);

}

[help]

PCM programmer,
I tried the code you provide and change the "B0" to A1. The problem is still there. When I pull out the 9V adaptor, the A1 LED on then off...Thanks...

[PCM programmer]

I changed the pin to A1 as shown below, and compiled with PCH vs.
4.039 and tested it on a PicDem2-Plus board. It works OK. It blinks
the LED.

If this code doesn't work, I think either your programmer doesn't work
or you have some other hardware problem on your board.

[help]

It works! I change #fuses setting to HS and NOLVP. Thank you!