My search pointed at the video card. I put the video card back in the first slot, and it booted fine. If it happens again, then it will be the memory.
This board had some problems.....guy that sold it to me didn't tell me about a bad capacitor, and since I swapped it out myself....well there was a learning curve that left me with only 2 operating slots and some likely damaged leads on the backside of the motherboard. It has been working fine (if not overclocked) until today's issue.
I'll keep an eye on it, I'd just hate to have to replace it so soon.