Onboard Ethernet

I have an Inspiron 8200 that has been incredible for me...I returned from a trip and can not get my ethernet connection to accept with the left side onboard ethernet port.  When I dock my machine, it will communicate through the ethernet port on the back side of the docking station.

 

I have installed/re-installed the drivers and every other savvy computer trick I know.  Is this a hardware problem and, if so, does Dell even sell the part for me to fix it?

 

-Desperate Jackson