Firstly test one controller + motor at a time with the power supply, with Arduino powered from USB at first - fewer things to go wrong.Adding 2k2 resistors in line in the logic signals from Arduino to L293D's will afford some protection to the Arduino and is a good idea whenfirst assembling things.You can use a 9V or 10V regulator chip to drop the 12V down a bit before the Arduino power-jack - this affords some protection from drop-outs on the 12V power if the motors are pushing it hard.What motors BTW? Have you ensured everything can take the maximum current drawn from all the motors?
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