No 5V+ from Arduino Uno R3 - Motors, Mechanics, Power and CNC

My son was using his Elegoo kit I got him. He had done lesson 3 (hardwire an LED), and was doing lesson 4 and could not get it to work. I then plugged in my Arduino Uno R3 to see if it was the Arduino. Same result. So I got out my volt meter, and I'm only getting a few millivolts between the V5 pin and GND. It's possible something was wrong with his circuit that fried the regulator on his board, and then when I plugged mine it it fried mine also? Anyway, I should always get +5 out of the

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