Any progress? This is rather frustrating - networking appears to be able to be restored via Windows Repair, but only until the next reboot. Windows disables both network adapters by default, and this POST code appears every time now. This has also caused problems in Linux, requiring me to use the secondary ethernet port as the first isn't even recognized.
I also noticed (possibly related) that the Dell Driver Update Utility says:
Intel(R) I210 Gigabit Network Connection:
This device is unknown or unsupported. Please contact the manufacturer for possible updates.
This is very unusual...