TrueNAS not booting

Full disclosure: I am BELOW newbie level. That said, I have used an old PC with an Asus Prime B250-M-K motherboard and 4 x 2TB Seagate HDDs to set up a RAID.

It was working fine until a couple of weeks ago, when it started restarting itself out of the blue. Then it began attempting to start up in the middle of the night, while it had been shut down. I say attempting because it would get stuck in a cycle where it would go through POST but when TrueNAS started up it would reboot a go through POST again indefinitely. Sometimes I would turn the power supply right off and start again and it would work, but it would eventually die again and go back into this weird cycle. At the moment, I have no access to my files. I just can’t get it started.

I am suspecting a hardware issue, probably motherboard. So now for my stupid question: if I get a new motherboard, how likely is it that I would be able to access all the information that is still on the hard drives? If I´ve lost all the photos that are stored there, I’m gonna need a lawyer to help me with the divorce…

Please help!

I am guessing you don’t have a downloaded system configuration for your system saved elsewhere. It should be pretty easy to do a new TrueNAS install on a new system, along with the 4 data drives and get access to the data. You might have to set up file sharing (SMB) again. Do you know what version of TrueNAS?