i agree with ur assesment. try some new ram ecc and non-ecc and see if u can get it running if not uv narrowed it down to what well its not the video card,mobo,cpu,ram,psu,hd and whats left is sound card, opticle drives, cables. Really uv narrowed out all the parts that could cause this lol. Well it wouldn't be the cpu and if the systme powers up psu is out of the race. Video card is out. So the major components that could cause this would be the hd/mobo/ram. see if there all seated right and cables are in the correct ports and way, etc. My guess would be the mobo is having a compatablity error or the bios needs a flash to work with your components.