A system crash with no clue about the reasons is normal on some mainboards.
I would go check your hardware
Dale Dellutri wrote:
Could you give more details? I’ve got servers that become completely unresponsive. I plug in a keyboard and monitor, and zip – the screen’s live, but nothing works, and I have to power cycle. Is it something like that, or did it crash by itself?
what sort of hardware was this? does it have lights out management port, like IPMI, that might provide a hardware event log? does it have ECC memory?