Help figuring out why PC is crashing/restarting when unattended

[danlightbulb]

Hi all.

PC is either crashing or restarting when unattended. Can anyone help me figure out why? Obviously the PC is unattended when it crashes, so I'm not here to observe what it is doing at the time. I leave it mining, but it will happily go for many hours without a crash so its random when it happens.

Thanks

 

[danlightbulb]

The CPU is overclocked as per my sig. The GPU is undervolted. Ive tested it for hours and its stable, but when I go away and leave it, I come back to find it rebooted.

Can you tell me what to look for in event viewer? There is lots in there but not sure what it all means.

 

[danlightbulb]

My problem seems to be linked to Firefox. I was mining just fine overnight, loaded firefox this morning and immediate blue screen 'system thread exception not handled'.