i introduced a class into arduino and told them only to work with an external power supply and right jumper setting. so a short-circuit has an effect only at the power supply - which is normally able to handle them.
when a short-circuit appears at the usb port, two mac dealers insured me that the port isn’t safe, so it would damage the logic board. today i’ve talked with an embedded linux developer and he told me that several short-circuits on the usb at his non apple laptop never hat an effect (because the os internal looks if the current is more then the 100mA enabled, and turns off if it is more)
are there an infos or results from users, what happens on a short-circuit at usb?