I don't hold ANY hope that this is "fixable". You have fried the Arduino chip. End of story. If the Arduino chip were in a socket, you could pull it out and toss it and replace it with a new Arduino chip. But Mega 2560 is hard-wired.The schematic diagram for Mega 2560 is here: http://arduino.cc/en/uploads/Main/arduino-mega2560-schematic.pdf
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