Yes and yes water in the ports can kill the system. Case ports run through cable on mobo are just the onboard sodared straight to the boardCould a faulty usb device or wet usb cable kill a pc ? and does it make a difference if its connected to the case USB ports instead of motherboard ones ?
Actually it didnt happen to me . i just have these midnight questions and i just apply them here, lol.I would likely check for damage to the mobo and/or power supply before discarding or replacing the other components based on age and relevance.