I have an OptiPlex 390 that I seldomly use (actually has probably been over a year since last used).  I recently had a situation where I had to use it.  Unfortunately, when I went to use it, it did not detect the network cable (doesn't have wifi).  Have checked the cable by connecting to another device, so I know that I have internet connection up to there.

Device manager states that all is well with the NIC card.  Using on-board NIC.

Tried using USB to Ethernet converter, but it couldn't install the driver due to no internet connection.

One curious thing is that I got a new laptop a day before yesterday, and it had a similar problem that wasn't resolved until ProSupport updated BIOS on the new laptop

Wondering what to try next.  Thanks in advance for your advice.