I ssh to my pi last night to add a line in crontab, I rebooted my pi and my heatmeter wasn’t registering on inputs. So I shut it down the correct way disconnected the usb’s the turned it back on. Since then I can’t connect to e on local and there are no lights on the Ethernet port. It does show up that is is connected to my network hardwired. Anyone have any ideas please or where to check.
Not that I am saying that you have done this but one time I had the same problem and it turned out that I had put the Enet into the other port for the temp sensors, just a thought 
John
If it’s not connecting to the network your only option is to connect an HDMI monitor to view the terminal output of the Pi to see what going on.