The story so far:
I started leaning toward heat being the root cause. First thing I did was move the tower away from the desk. There were some vent holes covered by the desk on the side of the tower. CTD
Opened the side of the tower. CTD
Noticed my sound card power cable was blocking airflow (sort of) to the GFX card heat sink. Moved it. CTD
Immediately on crashing I touched the heat sink with my finger to determine if it was hot. It was very hot to the touch. So I started thinking heat issues. Took an oscillating fan and turned it on full blast directly into the opened tower. CTD.
I also did my heat sink "finger" test. This time the heatsink was cool. So now I don't know if it is a heat issue or not.
Any help?