Assuming all the rest seems to be working, it’s possible the NIC is just fried. I lost one on a motheboard from a close lightning hit. The board worked fine otherwise, and a PCI NIC got that back up and running just fine. Never been inside one, it MAY be possible to replace, depending on how the system is built.
Everything else looks fine, which is so very little. Can’t ssh into it obviously. I might open it up and try having a look. I’ve replaced the fan in it, so I’ve had it open. I doubt there’s much I can do to fix this. I might just put it on the market for those that can fix the thing. Nics are like $6. Hehe.