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Have you configured the ip address of ethernet shield?
Have you set up the ip of the Ethernet shield? the ip should be same range as your PC's ip like 192.168.0.2 for PC192.168.0.10 for shield.And also some cheap W5100 shields has a problem with a resistor array situated near the RJ45 socket. It should be 510 instead of 511 (51Ohm instead of 510ohm)
"9 Degrees of Freedom" IMU
Persistence of Vision Wand
Arduino Wireless Animatronic Hand