Allegro bitmap problems

New at programming. Trying to create a 16-puzzle on allegro. I'm still at the stage of trying to make an image show up on the screen, but when I compile, the screen goes black and no image is shown. No error messages or warnings pop up.

#include <allegro.h>

void init();
void deinit();

int main() {
	init();
	
	BITMAP *my_pic;
	PALETTE palette;
	my_pic = load_bitmap("chihuahua.bmp", palette);
	
	if(my_pic==NULL)
	{
		set_gfx_mode(GFX_TEXT, 0,0,0,0);
		allegro_message("Can't load chihuahua.bmp");
		return 1;
	}

	while (!key[KEY_ESC]) {
		blit(my_pic, screen, 0,0,0,0,50,50);
		blit(my_pic, screen, 50,50,100,100,150,150);
		clear(my_pic);
	}
	
	destroy_bitmap(my_pic);
	deinit();
	return 0;
}
END_OF_MAIN()

void init() {
	int depth, res;
	allegro_init();
	depth = desktop_color_depth();
	if (depth == 0) depth = 32;
	set_color_depth(depth);
	res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);
	if (res != 0) {
		allegro_message(allegro_error);
		exit(-1);
	}

	install_timer();
	install_keyboard();
	install_mouse();
}

void deinit() {
	clear_keybuf();
}

I'm really frustrated, I've been at this for 3 days, to no avail. I'm on a time crunch, I still have alot to do with the code, and can't do any of it if the bitmap refuses to open. Any and all help is welcome.