I have a macbook air 11", 2014 model, 4GB RAM , 128GB SSD The right USB port works well, with everything i put on it. But the other , left one (near power port) doesn't work with some devices. For example, it works with a Sandisk usb flash 32GB , but it doesn't work with 2 others (16 an 4 GB) . It works with 2 external usb 3 disks (1TB and 2TB) but it doesn't with a simple Logitech mouse ! What can it be ? I run the Apple Diagnostics utility but it didn't shoed anything. Is it the logic board ?