U8glib: Graphics Lib for LCDs and OLEDs

Hi Oliver this is the program i used in my arduino mega and the lcd does not work and gives me a white light only

please help and thank you

U8GLIB_KS0108_128 u8g(29, 28, 27, 26, 25, 24, 23, 22, 37, 33, 34, 36, 35);

void draw(void) {

u8g.setFont(u8g_font_unifont);
u8g.setPrintPos(0, 20);

u8g.print("Hello World!");
}

void setup(void) {

u8g.setRot180();

}

void loop(void) {

u8g.firstPage();
do {
draw();
} while( u8g.nextPage() );

delay(500);
}