No UPS? When will people learn?
Funny enough, I do have a UPS. But for whatever reason it doesn't work right..... It shut off immediately without giving it time to properly shut down. *sigh*
Something I need to look into.
Corrupt boot media. Reinstall TrueNAS and a backup of your configuration. If you don't have a backup conf, you may be able to recover one from the old system.
I had an SSD attached at the time of the outage that won't boot at all, as in, it doesn't post anything, just a blank screen when it's supposed to be loading.
This is when I stick in an old USB boot drive that wasn't plugged in at the time of the loss of power.