Arduino MEGA + Ethernetshield

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(10,0,0,177);

EthernetServer server(80);

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);

  // SS must be output and disable any device using SS
  pinMode(53,OUTPUT);
  digitalWrite(53,HIGH); //any device on the SS pin will be disabled

  // disable w5100
  pinMode(10,OUTPUT);
  digitalWrite(10,HIGH);   // disable W5100

  // disable SD
  pinMode(4,OUTPUT);
  digitalWrite(4,HIGH);  // disable SD

  //Add code in function setup(), i'm success.
pinMode(11,INPUT);
pinMode(12,INPUT);
pinMode(13,INPUT);

  // start the Ethernet connection and the server:
  // Try DHCP first, if that fails, try fixed ip.
  if (Ethernet.begin(mac) == 0)
  {
    Serial.println(F("DHCP failed"));
    Ethernet.begin(mac,ip);
  }

  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
}

void loop() {
}