I had kind of similar/same issue no network and probably no webGUI(cuz i had no network/ unraid did not connected back no mater how many times i restarted it after waiting for 10+min) after i updated (7.0.1 -> 7.1.4). It was pain dinging in the back to plug monitor and keyboard to see if i have any monitor output. I google after that an saw this thread a bit late, I did have USB backup and was readying to go with the safe-mode and remove the cpu plugin and the unraid patch plugin as some ppl suggested above or backup restore route if it does not work after reading this thread. Here is what worked for me/FIXED IT: While I was reaching to unplug the unraid usb (and do that safe mode or backup restore routes) I saw that i had one bit-locker encrypted NTFS usb drive that i used in one of my windows VM's so I unplugged it and started the machine and my unraid came back to life... So I suggest try unplugin any external drives if you have any (beside the unraid usb) cuz that may fix it....