[System Restart during System Stability Test]

It usually means either a thermal issue (overheating), or a PSU (power supply) weakness, or a motherboard failure, or a RAM failure. I know, there're a lot of options, but stability issues are usually not easy to hunt down

Overheating is probably the easiest to diagnose: in the System Stability Test you can enable monitoring various temperature monitors, and you can track whether any of them show a too high value before the system restart.

Everything is new. Memory has been thoroughly tested through stress tests; the power supply, a 1200W, if anything, is understressed and stable; and using RealTemp, all temperatures appear stable during stresses. The only thing that is left would be some sort of motherboard failure that only happens during AIDA 64 testing. I will try enabling the temperature monitoring and watch during a re-run. Event log is not helpful either.

[System Restart during System Stability Test]

I have attempted to run the system stability test twoce with the same result - it starts, appears to run for 3 or so minutes, and then the system restarts. Using Version 1.60.1306 Beta. This is the only indication of any sort of problem with the system to date. Any advice would be appreciated.