Hey guys, This is my first post here on MacRumors. I am fairly certain that this is a unique post. I was working on a project for a robotics assignment, driving a couple of stepper motors with an external power supply, and something went wrong with the motor driver as I plugged the USB of the microcontroller into my 2012 MBPr 2.6GHz i7... Anyways somewhere between 7.5V and 10V ended up getting fed directly into my left USB port on my mac. The computer immediately shut down (it did this twice as I, an idiot, tried again after "fixing" my circuit). The computer still boots up, and the USB port appears to be working properly (I was able to transfer a file from a flash drive). I am wondering if I have mortally wounded my USB controller or motherboard. I have already had to MoBos go out on this macbook (those weren't my fault ). I am wondering if my computer will appear to be "fine" and will die on me within the next few hours, weeks, months, etc. As an added note, I know that most USB controllers that are worth their salt will contain an overvoltage, overcurrent protection circuit of some sort, but given that it shut down my entire computer I am a bit concerned that perhaps that circuit didn't do its job properly. Hopefully there is someone more knowledgeable than myself on this site who can help to calm my nerves and OCD. Thanks a lot guys, - Evan J.