No Ethernet on MacBook Pro Have had MAcBook for about 4 yrs., this is first time I can recall using ethernet, and computer doesn't see it. 

SD card reader quit working some time ago but USB is okay.

Ran diagnostic getting 4MEM/9/40000000 0:0x7f1c1390 error.
Under the list of network interfaces on the left that you have in the screenshot, press the + (plus) icon. For Interface, select Ethernet. Press Create. Does that work?