Crash with no BSOD

[MyCookedGooseEgg]

Twice my computer has crashed without any kind of trace. Yesterday I was programming in eclipse when it suddenly shut down, luckily ctrl + s is my middle name so nothing important was lost. Now today I was playing Civilization 5. The game crashed with a "driver issue" a few times so I dropped the quality and switched to the directx 9 version. (Note: I've been using dx10/11 version and high settings for about a year or two) This seemed to work as the game didn't crash for about an hour at which point my monitors lost signal for a few seconds before my PC restarted automatically.

My board (dig43l/agreygound) and CPU (Q8200) are significantly outdated and have been problematic in the past. I had actually planned to replace them this month, so I do hope one of those are the issue!

RAM is newer (about a year old, no problems)
GPU is MSI 7770 (also about a year old, never OC'd, no prior issues)

I've never had an issue with my temperatures and its been very cold where I live recently so while I will be monitoring them more closely for a while I don't think they are the cause.

I also don't believe it is a driver problem since I didn't recently update any and I hadn't had issues with civ or my pc as a whole until yesterday.

Since there isn't a blue screen I'd greatly appreciate somebody to point me in the right direction, thanks!

 

[Colif]

What power supply do you have?

 

[MyCookedGooseEgg]

PSU is 550w EVGA, not sure of the exact model number. It is also about a year old so I wouldn't expect that to be the source of the problem either