Arduino 2560 + Ethernet Module broken? :(

It happened that when connecting the Arduino Ethernet Module to the network, the device will automatically turn off. When I returned to disconnect and connect (several times), just lit the red light "ON" trailed off and seemed dead.
But when I disconnect the Ethernet module, the arduino returned to work.
I have reviewed and pins are properly connected.
That I can do to make the ethernet module working again?

Maybe your power source is too weak to power both the Arduino and the Ethernet Shield. What power source are you using?

I Using an USB 2.0 Port as Power Source.
You Think i should use an external Power adapter?

isantolin:
I Using an USB 2.0 Port as Power Source.
You Think i should use an external Power adapter?

I don't know how much power the Ethernet Shield draws but the USB input is limited to 500 mA. I'd try an external power adapter (7-9V and roughly 1000 mA).

I'D Tryed using a 12V - 1000 mA Power Adapter.
The Arduino red light "ON". But the ethernet module seems not light anyone.

I have the Ethernet module Damaged?