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[–] pfroo40 0 points 1 point (+1|-0) ago 

Does it have a standard ATX PSU or one of the tiny ones for small mini ITX cases? The smaller PSUs are notoriously bad... It could be heat related, otherwise. Your bios should have some thermal monitoring for the processor at least. What is it running at? Is it an integrated CPU, or socket with separate HSF? If it's separate, it's possible the heatsink isn't seated well. Did you use thermal paste, or thermal grease?

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[–] Modarn [S] ago 

update: So this weekend I went to rearrange the components to improve airflow. I was not successful (thing's didn't fit the way I'd hoped) but in the process I noticed that the MOBO power connector wasn't fully inserted/clipped. I think this explains all the symptoms, as every time I've had to open the case, I also had to dismount the PSU I would have been slightly shifting the positioning of the cable, giving it better or worse connections, which would be more or less susceptible to disruption.

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[–] Modarn [S] ago 

it doesn't have a full size psu. same sort of aspect ratio as ATX but a bit smaller. It's an i3 not overclocked cpu, with a stock fan, I put it on myself but it already had a thermal paste (or something) applied. it's running ubuntu, so I can use 'sensors' to get temps, I don't recall what the labels are, but the first two temps are (now) 28-29 ish and the next three are mid 40's, although I do recall seeing them up at 60. high temp threshold set at 85, critical at 100.