I replaced both the I/O cable and card and no change
I have an issue with my Right USB port.
After replacing the battery on my 15” retina from mid 2012. I replaced both the I/O cable and board and no change. Flash card and HDMI ports work fine.
USB works with some devices but not others. It does provide power to the devices, just doesn't see them.
Questa è una buona domanda?