Arduino Uno not working after Short-circuit While wiring up my new Arduino Uno R3, I accidentally shorted the 5V pin and the GND pin (for less than a sec). It was powered by a 12V 500mAh power supply through the Arduino DC power jack. . The ON, Rx, X1 and L LED's are glowing continuously, and also, pressing the reset button doesn't have any effect on the LED's and arduino doesn't restarts. How can I get my arduino working again?
The regualator of that 5V Blew up or the diode you need to read the schemtics of the Arduino Uno and check the circuits.

https://www.arduino.cc/en/uploads/Main/arduino-uno-schematic.pdf