ENC28J60 กับ Mega 2560

#include "SPI.h"
#include "Ethernet.h"


byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte server[] = { 173,194,126,119 }; // www.google.co.th

EthernetClient client;

void setup()
{
Serial.begin(9600);
if(Ethernet.begin(mac) == 0) { // start ethernet using mac & DHCP
Serial.println("Failed to configure Ethernet using DHCP");
while(true) // no point in carrying on, so stay in endless loop:
;
}
delay(1000); // give the Ethernet shield a second to initialize

Serial.print("This IP address: ");
IPAddress myIPAddress = Ethernet.localIP();
Serial.print(myIPAddress);
if(client.connect(server, 80)>0) {
Serial.println(" connected");
client.println("GET /search?q=arduino HTTP/1.0");
client.println();
} else {
Serial.println("connection failed");
}
}

void loop()
{
if (client.available()) {
char c = client.read();
// uncomment the next line to show all the received characters 
// Serial.print(c);
}

if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
for(;;)
;
}
}

อัพโคดตามนี้แล้วSerial Monitorขึ้นว่า Failed to configure Ethernet using DHCP แก้ไงยังไงครับ