First... sorry for my english...
I'm pretty new to Arduino, and i want to print what i want in the screen...
I am using Arduino mega, full graphic smart controller , and ramps 1.4; i found this code "hello world" with u8glib but it isn't work -> "avrdude: stk500v2_ReceiveMessage(): timeout" :

#include "U8glib.h"

U8GLIB_ST7920_128X64_4X u8g(23, 17, 16); // SPI Com: SCK = en = 18, MOSI = rw = 16, CS = di = 17


void draw(void) {
// graphic commands to redraw the complete screen should be placed here
u8g.setFont(u8g_font_unifont);
//u8g.setFont(u8g_font_osb21);
u8g.drawStr( 0, 22, "Hello World!");
}

void setup(void) {
// flip screen, if required
// u8g.setRot180();

// set SPI backup if required
//u8g.setHardwareBackup(u8g_backup_avr_spi);

// assign default color value
if ( u8g.getMode() == U8G_MODE_R3G3B2 ) {
u8g.setColorIndex(255); // white
}
else if ( u8g.getMode() == U8G_MODE_GRAY2BIT ) {
u8g.setColorIndex(3); // max intensity
}
else if ( u8g.getMode() == U8G_MODE_BW ) {
u8g.setColorIndex(1); // pixel on
}
else if ( u8g.getMode() == U8G_MODE_HICOLOR ) {
u8g.setHiColorByRGB(255,255,255);
}
}

void loop(void) {
// picture loop
u8g.firstPage();
do {
draw();
} while( u8g.nextPage() );

// rebuild the picture after some delay
delay(50);
}

someone can see the problem?

stk500v2_ReceiveMessage(): timeout" :

This message means the Arduino board is not responding. The problem could be the port setting or the board is not getting power etc.

you need to download the u8glib folder and save to the arduino library folder