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| + | [title] SMC reset and electrical checks |
|---|---|
| + | [* black] Both USB ports of a MacBook were dead after a shortage or overload on a Ramps Board that was connected to the Mac via an Arduino Board. |
| + | [* black] Normally Mac OS shows a message that tells you that the USB device got deactivated due to a power surge on that port. In this case the message wasn't displayed. It was later displayed after a reboot. Anyway both USB ports were instantly dead. |
| + | [* black] Here and there in the internet people advise to perform a SMC reset. That was done but didn't help. But you should try the SMC reset first. |
| + | [* black] Make yourself familiar with the pinout of your USB cable. Find the ground (GND) and measure with a multimeter if there is still an connection between both ground pins of the USB ports. |
| + | [* black] Check that there is really no power between ground and the +5V pin of the USB cable. |