Serverboard S5500BC restarting randomly

[CSpib]

I'm having issues with my configuration of an S5500BC, on the latest 64 BIOS, 32GB RDIMM (4x8), with 2x e5620 Xeons.

The Chassis is a Intel SC5650BRP which has a 600w PSU installed.

Randomly, the system will restart, it is running unRaid which is based on linux, but I am unable to capture a kernel panic, its almost as if someone has turned off the power then turned it back on. I have monitored this by setting up a webcam to watch the console output on the VGA screen. Sometimes it will run for a few hours, or a few days before rebooting, it doesn't seem to correlate to periods of high activity or usage on the system.

The error manager in the BIOS is blank, I have not yet checked the SEL log.

All the components test fine, I've ran tests on the memory and CPU's, the memory has actually been completely replaced with a different brand and the problem persists.

I have seen a couple of other threads on here with similar issues, but ultimately, no solution.

The board has come to me second hand so I don't know the history, its not impossible that it might just be failing given its age.

Any thoughts?

https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiJ14LH0qbTAhVM7BQKHRcNA3UQjhwIBQ&url=http://picclick.com/Intel-SC5650BRP-5U-Rack-or-Pedestal-Server-Chassis-252448689888.html&psig=AFQjCNEJtf2QIywlChfsDjCiN81IjaMzfQ&ust=1492351983590332 Intel SC5650BRP

[idata]

Hello Carl,

We are glad to hear the system is up and running after 3 days and 22 hours of uptime.Please let us know if there is anything else we could help you with?Best regards,Caesar B.