Hello!!!
First, sorry for my bad English.
punkish09, in the description of your problem, I saw exactly my problem. The same mother board. The same symptoms, the same sequence of errors.
In my case the problem was with the NForce4 chipset. it was heating. It's temp its temperature arrived 45ºC. The problem? The chipset's cooler stopped work. I don't know if you know, but the chipset's cooler of Asus A8N-SLI is very problematic. It simply stops work.
I really don't know if this will help you. That was my problem. Hope this helps.
