Well, here's the problem: If i connect my Arduino Mega to my PC or MAC both deactivate the USB port saying the USB device is consuming too much power.
Is there anything I can do to find out what's the problem with my Arduino?
If I connect to 12V with the other input it works perfectly.
If I measure resistance between GND and 5V USB input I get 30ohms ... is a correct value??
Thanks in advance for any assistance.