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#81
I had a chat with Jonathan about this and we agree the next pursuit should be a Power Supply.
The post makes me think PSU because it seems to get much worse when a video card is installed, although BSODs exist with only onboard graphics too. I'm guessing the increased power draw of the video card is putting it farther over the edge.
Other than that, motherboard would be my next guess, but if I had to recommend a purchase, it would be PSU first.