Hi Gadfly Inc,
Please follow the steps mentioned below to check if the adapter is detected properly.
1. Start the computer by pressing the power button
2. Press the F2 key 2-3 times
3. You will now be on the BIOS screen
4. Under the Main Tab look for the option that says AC Adapter Type
5. If the Adapter Type says Unknown or None with the adapter plugged in.
6. Reconnect the adapter to the machine and if the status now shows as Unknown then please update the BIOS again on the system.
7. Also, please check for Battery Health status under advanced tab in the BIOS.
Also, I would suggest you update the BIOS on the system again. Please enter your service tag # on the link below, select the OS, then download the BIOS from BIOS section onto the system and install it. Then run the diagnostics again.
Please let me know if this helps.