summit 400-48t port state "down"

[GreyRradean]

Hello, I hope someone can help with this issue.
Last night, I came home to find that my network was down. Upon inspecting the switch, I found that there were no activity lights on the ports at all (the 3 switch status lights on the left were showing fine). After about 3 power cycles I was able to get the switch to work for the rest of the evening, but this morning I woke up to find it was down again.
The management port on the back works and I am able to use the serial cable console, but no activity lights on the switch's ports. The log shows nothing outstanding.
I did a 'unconfigure switch all' and rebuilt everything from the factory settings, but that didn't seem to work either. The manual shows how to deal with "Limited Operation Mode and Minimal Operation Mode" (which seems to fit the symptoms perfectly), but walking through those instructions proved fruitless.
The default vlan shows a status of 'down' in the web interface, but I cannot for the life of me figure out how to affect that.
I am running EW ver. 7.2e.1b11

I am hoping my switch isn't broken. what do you think?

Grey