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  • Windows wouldn't have reacted fast enough to shut it down itself. The hardware driving the USB port will have overcurrent protection built in and would have shut down the port and notified the OS of this occurrence. It might be possible to avoid having to restart the PC by disabling and re-enabling the USB system from the Windows Device Manager but since your keyboard and mouse probably are USB devices this might be tricky. Commented Nov 18, 2016 at 13:27
  • But that said, shorting out the USB host controller can cause damage to your motherboard. If you are worried this might happen again, I'd suggest you run your arduino from a powered USB hub instead of directly from the PC, that way it won't risk maging the motherboard. Commented Nov 18, 2016 at 13:56