I'm sorry for the double post - put a similar one over in the Sierra sub-forum, but I am desperate, and really, really need help! How does one try to change the settings of your ethernet in Preferences, when the field to input the IP address is not active for long enough before an error message "Invalid IP Address" flashes up? The ethernet selection jumps to green, and flashes up that it is connected. 2 seconds later, it jumps down to below Bluetooth, and reverts to red - with status being ethernet cable is not connected. Then 2 seconds later, it connects again. I cannot adjust anything, because this loop just goes on and on, and doesn't allow me to enter anything quickly enough to apply and save. Mini was always connect via Wifi, and still can - but plugging an ethernet cable in, and it goes bonkers. Where do I even begin?