In situations like these it is always a good idea to use the reset button: use a paperclip to press and hold it for few seconds (make sure the device is unplugged).
We will have a troubleshooting guide (soon I hope) with this and other troubleshooting steps.
@nereocystis contacted @support and we’re handling from there now.
Resetting the memory did the trick. I had tried it last night, but was a bit rushed, and had not fully pulled it and reinserted it. Today, I fully reseated it, and it worked.
I did upgrade the memory to 32GB. I wonder if testing was done before memory was upgraded.
@mladen Thanks for your suggestion also. Unfortunately, the reset button did not work.